993 lines
47 KiB
Python
993 lines
47 KiB
Python
import inspect
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import re
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from typing import Callable, List, Optional, Union
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import numpy as np
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import torch
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import PIL
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from diffusers.onnx_utils import OnnxRuntimeModel
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from diffusers.pipeline_utils import DiffusionPipeline
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from diffusers.pipelines.stable_diffusion import StableDiffusionPipelineOutput
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from diffusers.schedulers import DDIMScheduler, LMSDiscreteScheduler, PNDMScheduler
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from diffusers.utils import logging
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from transformers import CLIPFeatureExtractor, CLIPTokenizer
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logger = logging.get_logger(__name__) # pylint: disable=invalid-name
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re_attention = re.compile(
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r"""
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\\\(|
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\\\)|
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\\\[|
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\\]|
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\\\\|
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\\|
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\(|
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\[|
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:([+-]?[.\d]+)\)|
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\)|
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]|
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[^\\()\[\]:]+|
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:
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""",
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re.X,
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)
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def parse_prompt_attention(text):
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"""
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Parses a string with attention tokens and returns a list of pairs: text and its associated weight.
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Accepted tokens are:
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(abc) - increases attention to abc by a multiplier of 1.1
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(abc:3.12) - increases attention to abc by a multiplier of 3.12
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[abc] - decreases attention to abc by a multiplier of 1.1
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\( - literal character '('
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\[ - literal character '['
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\) - literal character ')'
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\] - literal character ']'
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\\ - literal character '\'
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anything else - just text
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>>> parse_prompt_attention('normal text')
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[['normal text', 1.0]]
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>>> parse_prompt_attention('an (important) word')
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[['an ', 1.0], ['important', 1.1], [' word', 1.0]]
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>>> parse_prompt_attention('(unbalanced')
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[['unbalanced', 1.1]]
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>>> parse_prompt_attention('\(literal\]')
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[['(literal]', 1.0]]
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>>> parse_prompt_attention('(unnecessary)(parens)')
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[['unnecessaryparens', 1.1]]
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>>> parse_prompt_attention('a (((house:1.3)) [on] a (hill:0.5), sun, (((sky))).')
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[['a ', 1.0],
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['house', 1.5730000000000004],
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[' ', 1.1],
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['on', 1.0],
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[' a ', 1.1],
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['hill', 0.55],
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[', sun, ', 1.1],
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['sky', 1.4641000000000006],
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['.', 1.1]]
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"""
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res = []
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round_brackets = []
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square_brackets = []
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round_bracket_multiplier = 1.1
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square_bracket_multiplier = 1 / 1.1
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def multiply_range(start_position, multiplier):
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for p in range(start_position, len(res)):
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res[p][1] *= multiplier
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for m in re_attention.finditer(text):
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text = m.group(0)
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weight = m.group(1)
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if text.startswith("\\"):
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res.append([text[1:], 1.0])
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elif text == "(":
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round_brackets.append(len(res))
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elif text == "[":
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square_brackets.append(len(res))
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elif weight is not None and len(round_brackets) > 0:
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multiply_range(round_brackets.pop(), float(weight))
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elif text == ")" and len(round_brackets) > 0:
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multiply_range(round_brackets.pop(), round_bracket_multiplier)
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elif text == "]" and len(square_brackets) > 0:
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multiply_range(square_brackets.pop(), square_bracket_multiplier)
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else:
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res.append([text, 1.0])
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for pos in round_brackets:
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multiply_range(pos, round_bracket_multiplier)
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for pos in square_brackets:
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multiply_range(pos, square_bracket_multiplier)
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if len(res) == 0:
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res = [["", 1.0]]
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# merge runs of identical weights
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i = 0
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while i + 1 < len(res):
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if res[i][1] == res[i + 1][1]:
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res[i][0] += res[i + 1][0]
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res.pop(i + 1)
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else:
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i += 1
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return res
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def get_prompts_with_weights(pipe, prompt: List[str], max_length: int):
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r"""
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Tokenize a list of prompts and return its tokens with weights of each token.
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No padding, starting or ending token is included.
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"""
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tokens = []
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weights = []
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truncated = False
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for text in prompt:
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texts_and_weights = parse_prompt_attention(text)
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text_token = []
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text_weight = []
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for word, weight in texts_and_weights:
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# tokenize and discard the starting and the ending token
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token = pipe.tokenizer(word, return_tensors="np").input_ids[0, 1:-1]
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text_token += list(token)
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# copy the weight by length of token
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text_weight += [weight] * len(token)
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# stop if the text is too long (longer than truncation limit)
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if len(text_token) > max_length:
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truncated = True
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break
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# truncate
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if len(text_token) > max_length:
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truncated = True
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text_token = text_token[:max_length]
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text_weight = text_weight[:max_length]
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tokens.append(text_token)
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weights.append(text_weight)
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if truncated:
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logger.warning("Prompt was truncated. Try to shorten the prompt or increase max_embeddings_multiples")
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return tokens, weights
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def pad_tokens_and_weights(tokens, weights, max_length, bos, eos, no_boseos_middle=True, chunk_length=77):
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r"""
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Pad the tokens (with starting and ending tokens) and weights (with 1.0) to max_length.
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"""
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max_embeddings_multiples = (max_length - 2) // (chunk_length - 2)
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weights_length = max_length if no_boseos_middle else max_embeddings_multiples * chunk_length
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for i in range(len(tokens)):
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tokens[i] = [bos] + tokens[i] + [eos] * (max_length - 1 - len(tokens[i]))
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if no_boseos_middle:
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weights[i] = [1.0] + weights[i] + [1.0] * (max_length - 1 - len(weights[i]))
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else:
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w = []
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if len(weights[i]) == 0:
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w = [1.0] * weights_length
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else:
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for j in range(max_embeddings_multiples):
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w.append(1.0) # weight for starting token in this chunk
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w += weights[i][j * (chunk_length - 2) : min(len(weights[i]), (j + 1) * (chunk_length - 2))]
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w.append(1.0) # weight for ending token in this chunk
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w += [1.0] * (weights_length - len(w))
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weights[i] = w[:]
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return tokens, weights
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def get_unweighted_text_embeddings(
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pipe,
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text_input: np.array,
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chunk_length: int,
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no_boseos_middle: Optional[bool] = True,
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):
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"""
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When the length of tokens is a multiple of the capacity of the text encoder,
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it should be split into chunks and sent to the text encoder individually.
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"""
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max_embeddings_multiples = (text_input.shape[1] - 2) // (chunk_length - 2)
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if max_embeddings_multiples > 1:
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text_embeddings = []
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for i in range(max_embeddings_multiples):
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# extract the i-th chunk
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text_input_chunk = text_input[:, i * (chunk_length - 2) : (i + 1) * (chunk_length - 2) + 2].copy()
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# cover the head and the tail by the starting and the ending tokens
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text_input_chunk[:, 0] = text_input[0, 0]
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text_input_chunk[:, -1] = text_input[0, -1]
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text_embedding = pipe.text_encoder(input_ids=text_input_chunk)[0]
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if no_boseos_middle:
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if i == 0:
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# discard the ending token
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text_embedding = text_embedding[:, :-1]
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elif i == max_embeddings_multiples - 1:
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# discard the starting token
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text_embedding = text_embedding[:, 1:]
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else:
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# discard both starting and ending tokens
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text_embedding = text_embedding[:, 1:-1]
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text_embeddings.append(text_embedding)
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text_embeddings = np.concatenate(text_embeddings, axis=1)
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else:
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text_embeddings = pipe.text_encoder(input_ids=text_input)[0]
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return text_embeddings
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def get_weighted_text_embeddings(
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pipe,
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prompt: Union[str, List[str]],
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uncond_prompt: Optional[Union[str, List[str]]] = None,
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max_embeddings_multiples: Optional[int] = 4,
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no_boseos_middle: Optional[bool] = False,
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skip_parsing: Optional[bool] = False,
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skip_weighting: Optional[bool] = False,
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**kwargs,
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):
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r"""
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Prompts can be assigned with local weights using brackets. For example,
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prompt 'A (very beautiful) masterpiece' highlights the words 'very beautiful',
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and the embedding tokens corresponding to the words get multiplied by a constant, 1.1.
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Also, to regularize of the embedding, the weighted embedding would be scaled to preserve the original mean.
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Args:
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pipe (`DiffusionPipeline`):
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Pipe to provide access to the tokenizer and the text encoder.
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prompt (`str` or `List[str]`):
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The prompt or prompts to guide the image generation.
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uncond_prompt (`str` or `List[str]`):
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The unconditional prompt or prompts for guide the image generation. If unconditional prompt
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is provided, the embeddings of prompt and uncond_prompt are concatenated.
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max_embeddings_multiples (`int`, *optional*, defaults to `1`):
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The max multiple length of prompt embeddings compared to the max output length of text encoder.
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no_boseos_middle (`bool`, *optional*, defaults to `False`):
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If the length of text token is multiples of the capacity of text encoder, whether reserve the starting and
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ending token in each of the chunk in the middle.
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skip_parsing (`bool`, *optional*, defaults to `False`):
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Skip the parsing of brackets.
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skip_weighting (`bool`, *optional*, defaults to `False`):
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Skip the weighting. When the parsing is skipped, it is forced True.
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"""
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max_length = (pipe.tokenizer.model_max_length - 2) * max_embeddings_multiples + 2
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if isinstance(prompt, str):
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prompt = [prompt]
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if not skip_parsing:
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prompt_tokens, prompt_weights = get_prompts_with_weights(pipe, prompt, max_length - 2)
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if uncond_prompt is not None:
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if isinstance(uncond_prompt, str):
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uncond_prompt = [uncond_prompt]
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uncond_tokens, uncond_weights = get_prompts_with_weights(pipe, uncond_prompt, max_length - 2)
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else:
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prompt_tokens = [
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token[1:-1]
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for token in pipe.tokenizer(prompt, max_length=max_length, truncation=True, return_tensors="np").input_ids
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]
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prompt_weights = [[1.0] * len(token) for token in prompt_tokens]
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if uncond_prompt is not None:
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if isinstance(uncond_prompt, str):
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uncond_prompt = [uncond_prompt]
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uncond_tokens = [
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token[1:-1]
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for token in pipe.tokenizer(
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uncond_prompt,
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max_length=max_length,
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truncation=True,
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return_tensors="np",
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).input_ids
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]
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uncond_weights = [[1.0] * len(token) for token in uncond_tokens]
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# round up the longest length of tokens to a multiple of (model_max_length - 2)
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max_length = max([len(token) for token in prompt_tokens])
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if uncond_prompt is not None:
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max_length = max(max_length, max([len(token) for token in uncond_tokens]))
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max_embeddings_multiples = min(
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max_embeddings_multiples,
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(max_length - 1) // (pipe.tokenizer.model_max_length - 2) + 1,
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)
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max_embeddings_multiples = max(1, max_embeddings_multiples)
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max_length = (pipe.tokenizer.model_max_length - 2) * max_embeddings_multiples + 2
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# pad the length of tokens and weights
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bos = pipe.tokenizer.bos_token_id
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eos = pipe.tokenizer.eos_token_id
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prompt_tokens, prompt_weights = pad_tokens_and_weights(
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prompt_tokens,
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prompt_weights,
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max_length,
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bos,
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eos,
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no_boseos_middle=no_boseos_middle,
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chunk_length=pipe.tokenizer.model_max_length,
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)
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prompt_tokens = np.array(prompt_tokens, dtype=np.int32)
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if uncond_prompt is not None:
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uncond_tokens, uncond_weights = pad_tokens_and_weights(
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uncond_tokens,
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uncond_weights,
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max_length,
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bos,
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eos,
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no_boseos_middle=no_boseos_middle,
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chunk_length=pipe.tokenizer.model_max_length,
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)
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uncond_tokens = np.array(uncond_tokens, dtype=np.int32)
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# get the embeddings
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text_embeddings = get_unweighted_text_embeddings(
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pipe,
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prompt_tokens,
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pipe.tokenizer.model_max_length,
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no_boseos_middle=no_boseos_middle,
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)
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prompt_weights = np.array(prompt_weights, dtype=text_embeddings.dtype)
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if uncond_prompt is not None:
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uncond_embeddings = get_unweighted_text_embeddings(
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pipe,
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uncond_tokens,
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pipe.tokenizer.model_max_length,
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no_boseos_middle=no_boseos_middle,
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)
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uncond_weights = np.array(uncond_weights, dtype=uncond_embeddings.dtype)
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# assign weights to the prompts and normalize in the sense of mean
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# TODO: should we normalize by chunk or in a whole (current implementation)?
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if (not skip_parsing) and (not skip_weighting):
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previous_mean = text_embeddings.mean(axis=(-2, -1))
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text_embeddings *= prompt_weights[:, :, None]
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text_embeddings *= (previous_mean / text_embeddings.mean(axis=(-2, -1)))[:, None, None]
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if uncond_prompt is not None:
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previous_mean = uncond_embeddings.mean(axis=(-2, -1))
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uncond_embeddings *= uncond_weights[:, :, None]
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uncond_embeddings *= (previous_mean / uncond_embeddings.mean(axis=(-2, -1)))[:, None, None]
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# For classifier free guidance, we need to do two forward passes.
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# Here we concatenate the unconditional and text embeddings into a single batch
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# to avoid doing two forward passes
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if uncond_prompt is not None:
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return text_embeddings, uncond_embeddings
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return text_embeddings
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def preprocess_image(image):
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w, h = image.size
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w, h = map(lambda x: x - x % 32, (w, h)) # resize to integer multiple of 32
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image = image.resize((w, h), resample=PIL.Image.LANCZOS)
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image = np.array(image).astype(np.float32) / 255.0
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image = image[None].transpose(0, 3, 1, 2)
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return 2.0 * image - 1.0
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def preprocess_mask(mask):
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mask = mask.convert("L")
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w, h = mask.size
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w, h = map(lambda x: x - x % 32, (w, h)) # resize to integer multiple of 32
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mask = mask.resize((w // 8, h // 8), resample=PIL.Image.NEAREST)
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mask = np.array(mask).astype(np.float32) / 255.0
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mask = np.tile(mask, (4, 1, 1))
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mask = mask[None].transpose(0, 1, 2, 3) # what does this step do?
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mask = 1 - mask # repaint white, keep black
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return mask
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class OnnxStableDiffusionLongPromptWeightingPipeline(DiffusionPipeline):
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r"""
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Pipeline for text-to-image generation using Stable Diffusion without tokens length limit, and support parsing
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weighting in prompt.
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This model inherits from [`DiffusionPipeline`]. Check the superclass documentation for the generic methods the
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library implements for all the pipelines (such as downloading or saving, running on a particular device, etc.)
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"""
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def __init__(
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self,
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vae_encoder: OnnxRuntimeModel,
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vae_decoder: OnnxRuntimeModel,
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text_encoder: OnnxRuntimeModel,
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tokenizer: CLIPTokenizer,
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unet: OnnxRuntimeModel,
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scheduler: Union[DDIMScheduler, PNDMScheduler, LMSDiscreteScheduler],
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safety_checker: OnnxRuntimeModel,
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feature_extractor: CLIPFeatureExtractor,
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):
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super().__init__()
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self.register_modules(
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vae_encoder=vae_encoder,
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vae_decoder=vae_decoder,
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text_encoder=text_encoder,
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tokenizer=tokenizer,
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unet=unet,
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scheduler=scheduler,
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safety_checker=safety_checker,
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feature_extractor=feature_extractor,
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)
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@torch.no_grad()
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def __call__(
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self,
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prompt: Union[str, List[str]],
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negative_prompt: Optional[Union[str, List[str]]] = None,
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init_image: Union[np.ndarray, PIL.Image.Image] = None,
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mask_image: Union[np.ndarray, PIL.Image.Image] = None,
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height: int = 512,
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width: int = 512,
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num_inference_steps: int = 50,
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guidance_scale: float = 7.5,
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strength: float = 0.8,
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num_images_per_prompt: Optional[int] = 1,
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eta: float = 0.0,
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generator: Optional[np.random.RandomState] = None,
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latents: Optional[np.ndarray] = None,
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max_embeddings_multiples: Optional[int] = 3,
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output_type: Optional[str] = "pil",
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return_dict: bool = True,
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callback: Optional[Callable[[int, int, np.ndarray], None]] = None,
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is_cancelled_callback: Optional[Callable[[], bool]] = None,
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callback_steps: Optional[int] = 1,
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**kwargs,
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):
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r"""
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Function invoked when calling the pipeline for generation.
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Args:
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prompt (`str` or `List[str]`):
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The prompt or prompts to guide the image generation.
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negative_prompt (`str` or `List[str]`, *optional*):
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The prompt or prompts not to guide the image generation. Ignored when not using guidance (i.e., ignored
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if `guidance_scale` is less than `1`).
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init_image (`np.ndarray` or `PIL.Image.Image`):
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`Image`, or tensor representing an image batch, that will be used as the starting point for the
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process.
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mask_image (`np.ndarray` or `PIL.Image.Image`):
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`Image`, or tensor representing an image batch, to mask `init_image`. White pixels in the mask will be
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replaced by noise and therefore repainted, while black pixels will be preserved. If `mask_image` is a
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PIL image, it will be converted to a single channel (luminance) before use. If it's a tensor, it should
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contain one color channel (L) instead of 3, so the expected shape would be `(B, H, W, 1)`.
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height (`int`, *optional*, defaults to 512):
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The height in pixels of the generated image.
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width (`int`, *optional*, defaults to 512):
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The width in pixels of the generated image.
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num_inference_steps (`int`, *optional*, defaults to 50):
|
|
The number of denoising steps. More denoising steps usually lead to a higher quality image at the
|
|
expense of slower inference.
|
|
guidance_scale (`float`, *optional*, defaults to 7.5):
|
|
Guidance scale as defined in [Classifier-Free Diffusion Guidance](https://arxiv.org/abs/2207.12598).
|
|
`guidance_scale` is defined as `w` of equation 2. of [Imagen
|
|
Paper](https://arxiv.org/pdf/2205.11487.pdf). Guidance scale is enabled by setting `guidance_scale >
|
|
1`. Higher guidance scale encourages to generate images that are closely linked to the text `prompt`,
|
|
usually at the expense of lower image quality.
|
|
strength (`float`, *optional*, defaults to 0.8):
|
|
Conceptually, indicates how much to transform the reference `init_image`. Must be between 0 and 1.
|
|
`init_image` will be used as a starting point, adding more noise to it the larger the `strength`. The
|
|
number of denoising steps depends on the amount of noise initially added. When `strength` is 1, added
|
|
noise will be maximum and the denoising process will run for the full number of iterations specified in
|
|
`num_inference_steps`. A value of 1, therefore, essentially ignores `init_image`.
|
|
num_images_per_prompt (`int`, *optional*, defaults to 1):
|
|
The number of images to generate per prompt.
|
|
eta (`float`, *optional*, defaults to 0.0):
|
|
Corresponds to parameter eta (η) in the DDIM paper: https://arxiv.org/abs/2010.02502. Only applies to
|
|
[`schedulers.DDIMScheduler`], will be ignored for others.
|
|
generator (`np.random.RandomState`, *optional*):
|
|
A np.random.RandomState to make generation deterministic.
|
|
latents (`np.ndarray`, *optional*):
|
|
Pre-generated noisy latents, sampled from a Gaussian distribution, to be used as inputs for image
|
|
generation. Can be used to tweak the same generation with different prompts. If not provided, a latents
|
|
tensor will ge generated by sampling using the supplied random `generator`.
|
|
max_embeddings_multiples (`int`, *optional*, defaults to `3`):
|
|
The max multiple length of prompt embeddings compared to the max output length of text encoder.
|
|
output_type (`str`, *optional*, defaults to `"pil"`):
|
|
The output format of the generate image. Choose between
|
|
[PIL](https://pillow.readthedocs.io/en/stable/): `PIL.Image.Image` or `np.array`.
|
|
return_dict (`bool`, *optional*, defaults to `True`):
|
|
Whether or not to return a [`~pipelines.stable_diffusion.StableDiffusionPipelineOutput`] instead of a
|
|
plain tuple.
|
|
callback (`Callable`, *optional*):
|
|
A function that will be called every `callback_steps` steps during inference. The function will be
|
|
called with the following arguments: `callback(step: int, timestep: int, latents: np.ndarray)`.
|
|
is_cancelled_callback (`Callable`, *optional*):
|
|
A function that will be called every `callback_steps` steps during inference. If the function returns
|
|
`True`, the inference will be cancelled.
|
|
callback_steps (`int`, *optional*, defaults to 1):
|
|
The frequency at which the `callback` function will be called. If not specified, the callback will be
|
|
called at every step.
|
|
|
|
Returns:
|
|
`None` if cancelled by `is_cancelled_callback`,
|
|
[`~pipelines.stable_diffusion.StableDiffusionPipelineOutput`] or `tuple`:
|
|
[`~pipelines.stable_diffusion.StableDiffusionPipelineOutput`] if `return_dict` is True, otherwise a `tuple.
|
|
When returning a tuple, the first element is a list with the generated images, and the second element is a
|
|
list of `bool`s denoting whether the corresponding generated image likely represents "not-safe-for-work"
|
|
(nsfw) content, according to the `safety_checker`.
|
|
"""
|
|
|
|
if isinstance(prompt, str):
|
|
batch_size = 1
|
|
prompt = [prompt]
|
|
elif isinstance(prompt, list):
|
|
batch_size = len(prompt)
|
|
else:
|
|
raise ValueError(f"`prompt` has to be of type `str` or `list` but is {type(prompt)}")
|
|
|
|
if strength < 0 or strength > 1:
|
|
raise ValueError(f"The value of strength should in [0.0, 1.0] but is {strength}")
|
|
|
|
if height % 8 != 0 or width % 8 != 0:
|
|
raise ValueError(f"`height` and `width` have to be divisible by 8 but are {height} and {width}.")
|
|
|
|
if (callback_steps is None) or (
|
|
callback_steps is not None and (not isinstance(callback_steps, int) or callback_steps <= 0)
|
|
):
|
|
raise ValueError(
|
|
f"`callback_steps` has to be a positive integer but is {callback_steps} of type"
|
|
f" {type(callback_steps)}."
|
|
)
|
|
|
|
# get prompt text embeddings
|
|
|
|
# here `guidance_scale` is defined analog to the guidance weight `w` of equation (2)
|
|
# of the Imagen paper: https://arxiv.org/pdf/2205.11487.pdf . `guidance_scale = 1`
|
|
# corresponds to doing no classifier free guidance.
|
|
do_classifier_free_guidance = guidance_scale > 1.0
|
|
# get unconditional embeddings for classifier free guidance
|
|
if negative_prompt is None:
|
|
negative_prompt = [""] * batch_size
|
|
elif isinstance(negative_prompt, str):
|
|
negative_prompt = [negative_prompt] * batch_size
|
|
if batch_size != len(negative_prompt):
|
|
raise ValueError(
|
|
f"`negative_prompt`: {negative_prompt} has batch size {len(negative_prompt)}, but `prompt`:"
|
|
f" {prompt} has batch size {batch_size}. Please make sure that passed `negative_prompt` matches"
|
|
" the batch size of `prompt`."
|
|
)
|
|
|
|
if generator is None:
|
|
generator = np.random
|
|
|
|
text_embeddings, uncond_embeddings = get_weighted_text_embeddings(
|
|
pipe=self,
|
|
prompt=prompt,
|
|
uncond_prompt=negative_prompt if do_classifier_free_guidance else None,
|
|
max_embeddings_multiples=max_embeddings_multiples,
|
|
**kwargs,
|
|
)
|
|
|
|
text_embeddings = text_embeddings.repeat(num_images_per_prompt, 0)
|
|
if do_classifier_free_guidance:
|
|
uncond_embeddings = uncond_embeddings.repeat(num_images_per_prompt, 0)
|
|
text_embeddings = np.concatenate([uncond_embeddings, text_embeddings])
|
|
|
|
# set timesteps
|
|
self.scheduler.set_timesteps(num_inference_steps)
|
|
|
|
latents_dtype = text_embeddings.dtype
|
|
init_latents_orig = None
|
|
mask = None
|
|
noise = None
|
|
|
|
if init_image is None:
|
|
latents_shape = (
|
|
batch_size * num_images_per_prompt,
|
|
4,
|
|
height // 8,
|
|
width // 8,
|
|
)
|
|
|
|
if latents is None:
|
|
latents = generator.randn(*latents_shape).astype(latents_dtype)
|
|
elif latents.shape != latents_shape:
|
|
raise ValueError(f"Unexpected latents shape, got {latents.shape}, expected {latents_shape}")
|
|
|
|
timesteps = self.scheduler.timesteps.to(self.device)
|
|
|
|
# scale the initial noise by the standard deviation required by the scheduler
|
|
latents = latents * self.scheduler.init_noise_sigma
|
|
else:
|
|
if isinstance(init_image, PIL.Image.Image):
|
|
init_image = preprocess_image(init_image)
|
|
# encode the init image into latents and scale the latents
|
|
init_image = init_image.astype(latents_dtype)
|
|
init_latents = self.vae_encoder(sample=init_image)[0]
|
|
init_latents = 0.18215 * init_latents
|
|
init_latents = np.concatenate([init_latents] * batch_size * num_images_per_prompt)
|
|
init_latents_orig = init_latents
|
|
|
|
# preprocess mask
|
|
if mask_image is not None:
|
|
if isinstance(mask_image, PIL.Image.Image):
|
|
mask_image = preprocess_mask(mask_image)
|
|
mask_image = mask_image.astype(latents_dtype)
|
|
mask = np.concatenate([mask_image] * batch_size * num_images_per_prompt)
|
|
|
|
# check sizes
|
|
if not mask.shape == init_latents.shape:
|
|
print(mask.shape, init_latents.shape)
|
|
raise ValueError("The mask and init_image should be the same size!")
|
|
|
|
# get the original timestep using init_timestep
|
|
offset = self.scheduler.config.get("steps_offset", 0)
|
|
init_timestep = int(num_inference_steps * strength) + offset
|
|
init_timestep = min(init_timestep, num_inference_steps)
|
|
|
|
timesteps = self.scheduler.timesteps[-init_timestep]
|
|
timesteps = torch.tensor([timesteps] * batch_size * num_images_per_prompt)
|
|
|
|
# add noise to latents using the timesteps
|
|
noise = generator.randn(*init_latents.shape).astype(latents_dtype)
|
|
latents = self.scheduler.add_noise(
|
|
torch.from_numpy(init_latents), torch.from_numpy(noise), timesteps
|
|
).numpy()
|
|
|
|
t_start = max(num_inference_steps - init_timestep + offset, 0)
|
|
timesteps = self.scheduler.timesteps[t_start:]
|
|
|
|
# prepare extra kwargs for the scheduler step, since not all schedulers have the same signature
|
|
# eta (η) is only used with the DDIMScheduler, it will be ignored for other schedulers.
|
|
# eta corresponds to η in DDIM paper: https://arxiv.org/abs/2010.02502
|
|
# and should be between [0, 1]
|
|
accepts_eta = "eta" in set(inspect.signature(self.scheduler.step).parameters.keys())
|
|
extra_step_kwargs = {}
|
|
if accepts_eta:
|
|
extra_step_kwargs["eta"] = eta
|
|
|
|
for i, t in enumerate(self.progress_bar(timesteps)):
|
|
# expand the latents if we are doing classifier free guidance
|
|
latent_model_input = np.concatenate([latents] * 2) if do_classifier_free_guidance else latents
|
|
latent_model_input = self.scheduler.scale_model_input(latent_model_input, t)
|
|
|
|
# predict the noise residual
|
|
noise_pred = self.unet(
|
|
sample=latent_model_input,
|
|
timestep=np.array([t]),
|
|
encoder_hidden_states=text_embeddings,
|
|
)
|
|
noise_pred = noise_pred[0]
|
|
|
|
# perform guidance
|
|
if do_classifier_free_guidance:
|
|
noise_pred_uncond, noise_pred_text = np.split(noise_pred, 2)
|
|
noise_pred = noise_pred_uncond + guidance_scale * (noise_pred_text - noise_pred_uncond)
|
|
|
|
# compute the previous noisy sample x_t -> x_t-1
|
|
latents = self.scheduler.step(noise_pred, t, latents, **extra_step_kwargs).prev_sample.numpy()
|
|
|
|
if mask is not None:
|
|
# masking
|
|
init_latents_proper = self.scheduler.add_noise(
|
|
torch.from_numpy(init_latents_orig),
|
|
torch.from_numpy(noise),
|
|
torch.tensor([t]),
|
|
).numpy()
|
|
latents = (init_latents_proper * mask) + (latents * (1 - mask))
|
|
|
|
# call the callback, if provided
|
|
if i % callback_steps == 0:
|
|
if callback is not None:
|
|
callback(i, t, latents)
|
|
if is_cancelled_callback is not None and is_cancelled_callback():
|
|
return None
|
|
|
|
latents = 1 / 0.18215 * latents
|
|
# image = self.vae_decoder(latent_sample=latents)[0]
|
|
# it seems likes there is a problem for using half-precision vae decoder if batchsize>1
|
|
image = []
|
|
for i in range(latents.shape[0]):
|
|
image.append(self.vae_decoder(latent_sample=latents[i : i + 1])[0])
|
|
image = np.concatenate(image)
|
|
|
|
image = np.clip(image / 2 + 0.5, 0, 1)
|
|
image = image.transpose((0, 2, 3, 1))
|
|
|
|
if self.safety_checker is not None:
|
|
safety_checker_input = self.feature_extractor(
|
|
self.numpy_to_pil(image), return_tensors="np"
|
|
).pixel_values.astype(image.dtype)
|
|
# There will throw an error if use safety_checker directly and batchsize>1
|
|
images, has_nsfw_concept = [], []
|
|
for i in range(image.shape[0]):
|
|
image_i, has_nsfw_concept_i = self.safety_checker(
|
|
clip_input=safety_checker_input[i : i + 1], images=image[i : i + 1]
|
|
)
|
|
images.append(image_i)
|
|
has_nsfw_concept.append(has_nsfw_concept_i[0])
|
|
image = np.concatenate(images)
|
|
else:
|
|
has_nsfw_concept = None
|
|
|
|
if output_type == "pil":
|
|
image = self.numpy_to_pil(image)
|
|
|
|
if not return_dict:
|
|
return (image, has_nsfw_concept)
|
|
|
|
return StableDiffusionPipelineOutput(images=image, nsfw_content_detected=has_nsfw_concept)
|
|
|
|
def text2img(
|
|
self,
|
|
prompt: Union[str, List[str]],
|
|
negative_prompt: Optional[Union[str, List[str]]] = None,
|
|
height: int = 512,
|
|
width: int = 512,
|
|
num_inference_steps: int = 50,
|
|
guidance_scale: float = 7.5,
|
|
num_images_per_prompt: Optional[int] = 1,
|
|
eta: float = 0.0,
|
|
generator: Optional[np.random.RandomState] = None,
|
|
latents: Optional[np.ndarray] = None,
|
|
max_embeddings_multiples: Optional[int] = 3,
|
|
output_type: Optional[str] = "pil",
|
|
return_dict: bool = True,
|
|
callback: Optional[Callable[[int, int, np.ndarray], None]] = None,
|
|
callback_steps: Optional[int] = 1,
|
|
**kwargs,
|
|
):
|
|
r"""
|
|
Function for text-to-image generation.
|
|
Args:
|
|
prompt (`str` or `List[str]`):
|
|
The prompt or prompts to guide the image generation.
|
|
negative_prompt (`str` or `List[str]`, *optional*):
|
|
The prompt or prompts not to guide the image generation. Ignored when not using guidance (i.e., ignored
|
|
if `guidance_scale` is less than `1`).
|
|
height (`int`, *optional*, defaults to 512):
|
|
The height in pixels of the generated image.
|
|
width (`int`, *optional*, defaults to 512):
|
|
The width in pixels of the generated image.
|
|
num_inference_steps (`int`, *optional*, defaults to 50):
|
|
The number of denoising steps. More denoising steps usually lead to a higher quality image at the
|
|
expense of slower inference.
|
|
guidance_scale (`float`, *optional*, defaults to 7.5):
|
|
Guidance scale as defined in [Classifier-Free Diffusion Guidance](https://arxiv.org/abs/2207.12598).
|
|
`guidance_scale` is defined as `w` of equation 2. of [Imagen
|
|
Paper](https://arxiv.org/pdf/2205.11487.pdf). Guidance scale is enabled by setting `guidance_scale >
|
|
1`. Higher guidance scale encourages to generate images that are closely linked to the text `prompt`,
|
|
usually at the expense of lower image quality.
|
|
num_images_per_prompt (`int`, *optional*, defaults to 1):
|
|
The number of images to generate per prompt.
|
|
eta (`float`, *optional*, defaults to 0.0):
|
|
Corresponds to parameter eta (η) in the DDIM paper: https://arxiv.org/abs/2010.02502. Only applies to
|
|
[`schedulers.DDIMScheduler`], will be ignored for others.
|
|
generator (`np.random.RandomState`, *optional*):
|
|
A np.random.RandomState to make generation deterministic.
|
|
latents (`np.ndarray`, *optional*):
|
|
Pre-generated noisy latents, sampled from a Gaussian distribution, to be used as inputs for image
|
|
generation. Can be used to tweak the same generation with different prompts. If not provided, a latents
|
|
tensor will ge generated by sampling using the supplied random `generator`.
|
|
max_embeddings_multiples (`int`, *optional*, defaults to `3`):
|
|
The max multiple length of prompt embeddings compared to the max output length of text encoder.
|
|
output_type (`str`, *optional*, defaults to `"pil"`):
|
|
The output format of the generate image. Choose between
|
|
[PIL](https://pillow.readthedocs.io/en/stable/): `PIL.Image.Image` or `np.array`.
|
|
return_dict (`bool`, *optional*, defaults to `True`):
|
|
Whether or not to return a [`~pipelines.stable_diffusion.StableDiffusionPipelineOutput`] instead of a
|
|
plain tuple.
|
|
callback (`Callable`, *optional*):
|
|
A function that will be called every `callback_steps` steps during inference. The function will be
|
|
called with the following arguments: `callback(step: int, timestep: int, latents: np.ndarray)`.
|
|
callback_steps (`int`, *optional*, defaults to 1):
|
|
The frequency at which the `callback` function will be called. If not specified, the callback will be
|
|
called at every step.
|
|
Returns:
|
|
[`~pipelines.stable_diffusion.StableDiffusionPipelineOutput`] or `tuple`:
|
|
[`~pipelines.stable_diffusion.StableDiffusionPipelineOutput`] if `return_dict` is True, otherwise a `tuple.
|
|
When returning a tuple, the first element is a list with the generated images, and the second element is a
|
|
list of `bool`s denoting whether the corresponding generated image likely represents "not-safe-for-work"
|
|
(nsfw) content, according to the `safety_checker`.
|
|
"""
|
|
return self.__call__(
|
|
prompt=prompt,
|
|
negative_prompt=negative_prompt,
|
|
height=height,
|
|
width=width,
|
|
num_inference_steps=num_inference_steps,
|
|
guidance_scale=guidance_scale,
|
|
num_images_per_prompt=num_images_per_prompt,
|
|
eta=eta,
|
|
generator=generator,
|
|
latents=latents,
|
|
max_embeddings_multiples=max_embeddings_multiples,
|
|
output_type=output_type,
|
|
return_dict=return_dict,
|
|
callback=callback,
|
|
callback_steps=callback_steps,
|
|
**kwargs,
|
|
)
|
|
|
|
def img2img(
|
|
self,
|
|
init_image: Union[np.ndarray, PIL.Image.Image],
|
|
prompt: Union[str, List[str]],
|
|
negative_prompt: Optional[Union[str, List[str]]] = None,
|
|
strength: float = 0.8,
|
|
num_inference_steps: Optional[int] = 50,
|
|
guidance_scale: Optional[float] = 7.5,
|
|
num_images_per_prompt: Optional[int] = 1,
|
|
eta: Optional[float] = 0.0,
|
|
generator: Optional[np.random.RandomState] = None,
|
|
max_embeddings_multiples: Optional[int] = 3,
|
|
output_type: Optional[str] = "pil",
|
|
return_dict: bool = True,
|
|
callback: Optional[Callable[[int, int, np.ndarray], None]] = None,
|
|
callback_steps: Optional[int] = 1,
|
|
**kwargs,
|
|
):
|
|
r"""
|
|
Function for image-to-image generation.
|
|
Args:
|
|
init_image (`np.ndarray` or `PIL.Image.Image`):
|
|
`Image`, or ndarray representing an image batch, that will be used as the starting point for the
|
|
process.
|
|
prompt (`str` or `List[str]`):
|
|
The prompt or prompts to guide the image generation.
|
|
negative_prompt (`str` or `List[str]`, *optional*):
|
|
The prompt or prompts not to guide the image generation. Ignored when not using guidance (i.e., ignored
|
|
if `guidance_scale` is less than `1`).
|
|
strength (`float`, *optional*, defaults to 0.8):
|
|
Conceptually, indicates how much to transform the reference `init_image`. Must be between 0 and 1.
|
|
`init_image` will be used as a starting point, adding more noise to it the larger the `strength`. The
|
|
number of denoising steps depends on the amount of noise initially added. When `strength` is 1, added
|
|
noise will be maximum and the denoising process will run for the full number of iterations specified in
|
|
`num_inference_steps`. A value of 1, therefore, essentially ignores `init_image`.
|
|
num_inference_steps (`int`, *optional*, defaults to 50):
|
|
The number of denoising steps. More denoising steps usually lead to a higher quality image at the
|
|
expense of slower inference. This parameter will be modulated by `strength`.
|
|
guidance_scale (`float`, *optional*, defaults to 7.5):
|
|
Guidance scale as defined in [Classifier-Free Diffusion Guidance](https://arxiv.org/abs/2207.12598).
|
|
`guidance_scale` is defined as `w` of equation 2. of [Imagen
|
|
Paper](https://arxiv.org/pdf/2205.11487.pdf). Guidance scale is enabled by setting `guidance_scale >
|
|
1`. Higher guidance scale encourages to generate images that are closely linked to the text `prompt`,
|
|
usually at the expense of lower image quality.
|
|
num_images_per_prompt (`int`, *optional*, defaults to 1):
|
|
The number of images to generate per prompt.
|
|
eta (`float`, *optional*, defaults to 0.0):
|
|
Corresponds to parameter eta (η) in the DDIM paper: https://arxiv.org/abs/2010.02502. Only applies to
|
|
[`schedulers.DDIMScheduler`], will be ignored for others.
|
|
generator (`np.random.RandomState`, *optional*):
|
|
A np.random.RandomState to make generation deterministic.
|
|
max_embeddings_multiples (`int`, *optional*, defaults to `3`):
|
|
The max multiple length of prompt embeddings compared to the max output length of text encoder.
|
|
output_type (`str`, *optional*, defaults to `"pil"`):
|
|
The output format of the generate image. Choose between
|
|
[PIL](https://pillow.readthedocs.io/en/stable/): `PIL.Image.Image` or `np.array`.
|
|
return_dict (`bool`, *optional*, defaults to `True`):
|
|
Whether or not to return a [`~pipelines.stable_diffusion.StableDiffusionPipelineOutput`] instead of a
|
|
plain tuple.
|
|
callback (`Callable`, *optional*):
|
|
A function that will be called every `callback_steps` steps during inference. The function will be
|
|
called with the following arguments: `callback(step: int, timestep: int, latents: np.ndarray)`.
|
|
callback_steps (`int`, *optional*, defaults to 1):
|
|
The frequency at which the `callback` function will be called. If not specified, the callback will be
|
|
called at every step.
|
|
Returns:
|
|
[`~pipelines.stable_diffusion.StableDiffusionPipelineOutput`] or `tuple`:
|
|
[`~pipelines.stable_diffusion.StableDiffusionPipelineOutput`] if `return_dict` is True, otherwise a `tuple.
|
|
When returning a tuple, the first element is a list with the generated images, and the second element is a
|
|
list of `bool`s denoting whether the corresponding generated image likely represents "not-safe-for-work"
|
|
(nsfw) content, according to the `safety_checker`.
|
|
"""
|
|
return self.__call__(
|
|
prompt=prompt,
|
|
negative_prompt=negative_prompt,
|
|
init_image=init_image,
|
|
num_inference_steps=num_inference_steps,
|
|
guidance_scale=guidance_scale,
|
|
strength=strength,
|
|
num_images_per_prompt=num_images_per_prompt,
|
|
eta=eta,
|
|
generator=generator,
|
|
max_embeddings_multiples=max_embeddings_multiples,
|
|
output_type=output_type,
|
|
return_dict=return_dict,
|
|
callback=callback,
|
|
callback_steps=callback_steps,
|
|
**kwargs,
|
|
)
|
|
|
|
def inpaint(
|
|
self,
|
|
init_image: Union[np.ndarray, PIL.Image.Image],
|
|
mask_image: Union[np.ndarray, PIL.Image.Image],
|
|
prompt: Union[str, List[str]],
|
|
negative_prompt: Optional[Union[str, List[str]]] = None,
|
|
strength: float = 0.8,
|
|
num_inference_steps: Optional[int] = 50,
|
|
guidance_scale: Optional[float] = 7.5,
|
|
num_images_per_prompt: Optional[int] = 1,
|
|
eta: Optional[float] = 0.0,
|
|
generator: Optional[np.random.RandomState] = None,
|
|
max_embeddings_multiples: Optional[int] = 3,
|
|
output_type: Optional[str] = "pil",
|
|
return_dict: bool = True,
|
|
callback: Optional[Callable[[int, int, np.ndarray], None]] = None,
|
|
callback_steps: Optional[int] = 1,
|
|
**kwargs,
|
|
):
|
|
r"""
|
|
Function for inpaint.
|
|
Args:
|
|
init_image (`np.ndarray` or `PIL.Image.Image`):
|
|
`Image`, or tensor representing an image batch, that will be used as the starting point for the
|
|
process. This is the image whose masked region will be inpainted.
|
|
mask_image (`np.ndarray` or `PIL.Image.Image`):
|
|
`Image`, or tensor representing an image batch, to mask `init_image`. White pixels in the mask will be
|
|
replaced by noise and therefore repainted, while black pixels will be preserved. If `mask_image` is a
|
|
PIL image, it will be converted to a single channel (luminance) before use. If it's a tensor, it should
|
|
contain one color channel (L) instead of 3, so the expected shape would be `(B, H, W, 1)`.
|
|
prompt (`str` or `List[str]`):
|
|
The prompt or prompts to guide the image generation.
|
|
negative_prompt (`str` or `List[str]`, *optional*):
|
|
The prompt or prompts not to guide the image generation. Ignored when not using guidance (i.e., ignored
|
|
if `guidance_scale` is less than `1`).
|
|
strength (`float`, *optional*, defaults to 0.8):
|
|
Conceptually, indicates how much to inpaint the masked area. Must be between 0 and 1. When `strength`
|
|
is 1, the denoising process will be run on the masked area for the full number of iterations specified
|
|
in `num_inference_steps`. `init_image` will be used as a reference for the masked area, adding more
|
|
noise to that region the larger the `strength`. If `strength` is 0, no inpainting will occur.
|
|
num_inference_steps (`int`, *optional*, defaults to 50):
|
|
The reference number of denoising steps. More denoising steps usually lead to a higher quality image at
|
|
the expense of slower inference. This parameter will be modulated by `strength`, as explained above.
|
|
guidance_scale (`float`, *optional*, defaults to 7.5):
|
|
Guidance scale as defined in [Classifier-Free Diffusion Guidance](https://arxiv.org/abs/2207.12598).
|
|
`guidance_scale` is defined as `w` of equation 2. of [Imagen
|
|
Paper](https://arxiv.org/pdf/2205.11487.pdf). Guidance scale is enabled by setting `guidance_scale >
|
|
1`. Higher guidance scale encourages to generate images that are closely linked to the text `prompt`,
|
|
usually at the expense of lower image quality.
|
|
num_images_per_prompt (`int`, *optional*, defaults to 1):
|
|
The number of images to generate per prompt.
|
|
eta (`float`, *optional*, defaults to 0.0):
|
|
Corresponds to parameter eta (η) in the DDIM paper: https://arxiv.org/abs/2010.02502. Only applies to
|
|
[`schedulers.DDIMScheduler`], will be ignored for others.
|
|
generator (`np.random.RandomState`, *optional*):
|
|
A np.random.RandomState to make generation deterministic.
|
|
max_embeddings_multiples (`int`, *optional*, defaults to `3`):
|
|
The max multiple length of prompt embeddings compared to the max output length of text encoder.
|
|
output_type (`str`, *optional*, defaults to `"pil"`):
|
|
The output format of the generate image. Choose between
|
|
[PIL](https://pillow.readthedocs.io/en/stable/): `PIL.Image.Image` or `np.array`.
|
|
return_dict (`bool`, *optional*, defaults to `True`):
|
|
Whether or not to return a [`~pipelines.stable_diffusion.StableDiffusionPipelineOutput`] instead of a
|
|
plain tuple.
|
|
callback (`Callable`, *optional*):
|
|
A function that will be called every `callback_steps` steps during inference. The function will be
|
|
called with the following arguments: `callback(step: int, timestep: int, latents: np.ndarray)`.
|
|
callback_steps (`int`, *optional*, defaults to 1):
|
|
The frequency at which the `callback` function will be called. If not specified, the callback will be
|
|
called at every step.
|
|
Returns:
|
|
[`~pipelines.stable_diffusion.StableDiffusionPipelineOutput`] or `tuple`:
|
|
[`~pipelines.stable_diffusion.StableDiffusionPipelineOutput`] if `return_dict` is True, otherwise a `tuple.
|
|
When returning a tuple, the first element is a list with the generated images, and the second element is a
|
|
list of `bool`s denoting whether the corresponding generated image likely represents "not-safe-for-work"
|
|
(nsfw) content, according to the `safety_checker`.
|
|
"""
|
|
return self.__call__(
|
|
prompt=prompt,
|
|
negative_prompt=negative_prompt,
|
|
init_image=init_image,
|
|
mask_image=mask_image,
|
|
num_inference_steps=num_inference_steps,
|
|
guidance_scale=guidance_scale,
|
|
strength=strength,
|
|
num_images_per_prompt=num_images_per_prompt,
|
|
eta=eta,
|
|
generator=generator,
|
|
max_embeddings_multiples=max_embeddings_multiples,
|
|
output_type=output_type,
|
|
return_dict=return_dict,
|
|
callback=callback,
|
|
callback_steps=callback_steps,
|
|
**kwargs,
|
|
)
|