546 lines
17 KiB
Python
546 lines
17 KiB
Python
# coding=utf-8
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# Copyright 2024 Starcoder2 AI and the HuggingFace Inc. team. All rights reserved.
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#
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# This code is based on EleutherAI's GPT-NeoX library and the GPT-NeoX
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# and OPT implementations in this library. It has been modified from its
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# original forms to accommodate minor architectural differences compared
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# to GPT-NeoX and OPT used by the Meta AI team that trained the model.
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#
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# Licensed under the Apache License, Version 2.0 (the "License");
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# you may not use this file except in compliance with the License.
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# You may obtain a copy of the License at
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#
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# http://www.apache.org/licenses/LICENSE-2.0
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#
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# Unless required by applicable law or agreed to in writing, software
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# distributed under the License is distributed on an "AS IS" BASIS,
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# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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# See the License for the specific language governing permissions and
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# limitations under the License.
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import torch
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import torch.distributed
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from torch import nn
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from transformers.activations import ACT2FN
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from transformers.configuration_utils import PretrainedConfig
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from typing import Optional, List, Tuple
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from text_generation_server.utils import paged_attention, flash_attn
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from text_generation_server.utils.layers import (
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TensorParallelRowLinear,
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TensorParallelColumnLinear,
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TensorParallelEmbedding,
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PositionRotaryEmbedding,
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SpeculativeHead,
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get_linear,
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FastRMSNorm,
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FastLayerNorm,
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)
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class Starcoder2Config(PretrainedConfig):
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model_type = "starcoder2"
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def __init__(
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self,
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vocab_size=49152,
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hidden_size=3072,
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intermediate_size=12288,
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num_hidden_layers=30,
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num_attention_heads=24,
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num_key_value_heads=2,
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mlp_type="default",
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hidden_act="gelu_pytorch_tanh",
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max_position_embeddings=4096,
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initializer_range=0.018042,
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norm_type="layer_norm",
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norm_epsilon=1e-5,
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use_cache=True,
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bos_token_id=50256,
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eos_token_id=50256,
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rope_theta=10000.0,
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sliding_window=None,
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attention_dropout=0.0,
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residual_dropout=0.0,
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embedding_dropout=0.0,
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use_bias: bool = True,
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**kwargs,
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):
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self.vocab_size = vocab_size
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self.max_position_embeddings = max_position_embeddings
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self.hidden_size = hidden_size
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self.intermediate_size = intermediate_size
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self.num_hidden_layers = num_hidden_layers
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self.num_attention_heads = num_attention_heads
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self.sliding_window = sliding_window
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self.use_bias = use_bias
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# for backward compatibility
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if num_key_value_heads is None:
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num_key_value_heads = num_attention_heads
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self.num_key_value_heads = num_key_value_heads
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self.mlp_type = mlp_type
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self.hidden_act = hidden_act
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self.initializer_range = initializer_range
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self.norm_type = norm_type
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self.norm_epsilon = norm_epsilon
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self.use_cache = use_cache
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self.rope_theta = rope_theta
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self.attention_dropout = attention_dropout
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self.residual_dropout = residual_dropout
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self.embedding_dropout = embedding_dropout
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super().__init__(
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bos_token_id=bos_token_id,
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eos_token_id=eos_token_id,
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**kwargs,
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)
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def load_attention(config, prefix, weights):
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if config.num_attention_heads != config.num_key_value_heads:
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return _load_gqa(config, prefix, weights)
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else:
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return TensorParallelColumnLinear.load_multi(
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config,
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prefixes=[f"{prefix}.q_proj", f"{prefix}.k_proj", f"{prefix}.v_proj"],
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dim=0,
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weights=weights,
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bias=config.use_bias,
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)
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def _load_gqa(config, prefix: str, weights):
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assert config.hidden_size % config.num_attention_heads == 0
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assert config.num_attention_heads % weights.process_group.size() == 0
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weight = weights.get_multi_weights_col(
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prefixes=[f"{prefix}.q_proj", f"{prefix}.k_proj", f"{prefix}.v_proj"],
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quantize=config.quantize,
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dim=0,
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)
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if config.quantize not in ["gptq", "awq"]:
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weight = weight.to(dtype=weights.dtype).to(device=weights.device)
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head_size = config.hidden_size // config.num_attention_heads
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num_heads = config.num_attention_heads // weights.process_group.size()
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num_key_value_heads = config.num_key_value_heads // weights.process_group.size()
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assert list(weight.shape) == [
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(num_heads + 2 * num_key_value_heads) * head_size,
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config.hidden_size,
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], f"{list(weight.shape)} != {[(num_heads + 2 * config.num_key_value_heads) * head_size, config.hidden_size]}"
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if config.use_bias:
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w = [
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weights.get_sharded(f"{p}.bias", dim=0)
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for p in [f"{prefix}.q_proj", f"{prefix}.k_proj", f"{prefix}.v_proj"]
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]
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bias = torch.cat(w, dim=0).to(dtype=weights.dtype).to(device=weights.device)
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else:
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bias = None
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return TensorParallelColumnLinear(
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get_linear(weight, bias=bias, quantize=config.quantize)
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)
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class Starcoder2Attention(torch.nn.Module):
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def __init__(
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self,
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prefix: str,
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config,
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weights,
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):
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super().__init__()
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self.max_past = (
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config.sliding_window if config.sliding_window is not None else -1
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)
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self.num_heads = config.num_attention_heads
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self.hidden_size = config.hidden_size
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self.head_size = self.hidden_size // self.num_heads
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self.rotary_emb = PositionRotaryEmbedding.static(
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config=config,
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dim=self.head_size,
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base=config.rope_theta,
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device=weights.device,
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)
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self.softmax_scale = self.head_size**-0.5
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if self.num_heads % weights.process_group.size() != 0:
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raise ValueError(
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f"`num_heads` must be divisible by `num_shards` (got `num_heads`: {self.num_heads} "
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f"and `num_shards`: {weights.process_group.size()}"
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)
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self.num_heads = self.num_heads // weights.process_group.size()
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self.num_key_value_heads = (
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config.num_key_value_heads // weights.process_group.size()
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)
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self.query_key_value = load_attention(config, prefix, weights)
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self.o_proj = TensorParallelRowLinear.load(
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config,
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prefix=f"{prefix}.o_proj",
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weights=weights,
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bias=config.use_bias,
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)
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self.num_groups = self.num_heads // self.num_key_value_heads
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self.kv_head_mapping = torch.arange(
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0, self.num_key_value_heads, dtype=torch.int32, device=weights.device
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).repeat_interleave(self.num_groups)
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def forward(
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self,
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hidden_states,
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cos,
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sin,
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cu_seqlen_prefill,
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kv_cache,
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block_tables,
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slots,
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input_lengths,
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max_s,
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prefill_cache_indices,
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):
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qkv = self.query_key_value(hidden_states)
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query, kv = qkv.split(
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[
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self.head_size * self.num_heads,
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2 * self.head_size * self.num_key_value_heads,
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],
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dim=1,
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)
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query = query.view(-1, self.num_heads, self.head_size)
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kv = kv.view(-1, 2, self.num_key_value_heads, self.head_size)
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self.rotary_emb(query, torch.select(kv, dim=1, index=0), cos, sin)
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if prefill_cache_indices is not None:
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kv_to_cache = kv[prefill_cache_indices]
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else:
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kv_to_cache = kv
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paged_attention.reshape_and_cache(
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kv_to_cache[:, 0], kv_to_cache[:, 1], kv_cache[0], kv_cache[1], slots
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)
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# output tensor
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attn_output = torch.empty_like(query)
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# Prefill
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if cu_seqlen_prefill is not None:
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# flash attention
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flash_attn.attention(
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query,
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torch.select(kv, dim=1, index=0),
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torch.select(kv, dim=1, index=1),
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attn_output,
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cu_seqlen_prefill,
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max_s,
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self.softmax_scale,
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window_size_left=self.max_past,
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)
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# Decode
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else:
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paged_attention.attention(
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attn_output,
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query,
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kv_cache[0],
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kv_cache[1],
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self.kv_head_mapping,
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self.softmax_scale,
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block_tables,
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input_lengths,
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max_s,
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)
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return self.o_proj(attn_output.view(-1, self.num_heads * self.head_size))
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class Starcoder2MLP(nn.Module):
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def __init__(self, prefix, config, weights):
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super().__init__()
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act = config.hidden_act
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self.act = (
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ACT2FN[act]
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if "gelu" not in act
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else lambda x: torch.nn.functional.gelu(
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x,
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approximate=(
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"tanh" if act in ["gelu_fast", "gelu_pytorch_tanh"] else "none"
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),
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)
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)
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# Fuse gate and up proj
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self.c_fc = TensorParallelColumnLinear.load(
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config,
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prefix=f"{prefix}.c_fc",
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weights=weights,
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bias=config.use_bias,
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)
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self.c_proj = TensorParallelRowLinear.load(
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config,
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prefix=f"{prefix}.c_proj",
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weights=weights,
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bias=config.use_bias,
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)
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def forward(self, hidden_states):
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hidden_states = self.c_fc(hidden_states)
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hidden_states = self.act(hidden_states)
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return self.c_proj(hidden_states)
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class Starcoder2GatedMLP(nn.Module):
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def __init__(self, prefix, config, weights):
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super().__init__()
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act = config.hidden_act
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self.act = (
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ACT2FN[act]
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if "gelu" not in act
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else lambda x: torch.nn.functional.gelu(
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x,
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approximate=(
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"tanh" if act in ["gelu_fast", "gelu_pytorch_tanh"] else "none"
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),
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)
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)
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# Fuse gate and up proj
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self.gate_up_proj = TensorParallelColumnLinear.load_multi(
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config,
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prefixes=[f"{prefix}.gate_proj", f"{prefix}.up_proj"],
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weights=weights,
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dim=0,
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bias=config.use_bias,
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)
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self.down_proj = TensorParallelRowLinear.load(
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config,
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prefix=f"{prefix}.down_proj",
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weights=weights,
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bias=config.use_bias,
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)
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self.intermediate_size = (
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config.intermediate_size // weights.process_group.size()
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)
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def forward(self, hidden_states):
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gate_up_states = self.gate_up_proj(hidden_states)
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gate_up_states = gate_up_states.view(-1, 2, self.intermediate_size)
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return self.down_proj(self.act(gate_up_states[:, 0]) * gate_up_states[:, 1])
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STARCODER2_NORMALIZATION_CLASSES = {
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"layer_norm": FastLayerNorm,
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"rms_norm": FastRMSNorm,
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}
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STARCODER2_MLP_CLASSES = {
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"default": Starcoder2MLP,
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"gated": Starcoder2GatedMLP,
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}
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class Starcoder2Layer(nn.Module):
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def __init__(self, layer_id, config, weights):
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super().__init__()
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prefix = f"model.layers.{layer_id}"
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self.self_attn = Starcoder2Attention(
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prefix=f"{prefix}.self_attn", config=config, weights=weights
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)
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self.mlp = STARCODER2_MLP_CLASSES[config.mlp_type](
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prefix=f"{prefix}.mlp", config=config, weights=weights
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)
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self.input_layernorm = STARCODER2_NORMALIZATION_CLASSES[config.norm_type].load(
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prefix=f"{prefix}.input_layernorm", weights=weights, eps=config.norm_epsilon
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)
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self.post_attention_layernorm = STARCODER2_NORMALIZATION_CLASSES[
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config.norm_type
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].load(
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prefix=f"{prefix}.post_attention_layernorm",
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weights=weights,
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eps=config.norm_epsilon,
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)
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def forward(
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self,
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hidden_states,
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residual,
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cos,
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sin,
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cu_seqlen_prefill,
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kv_cache,
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block_tables,
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slots,
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input_lengths,
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max_s,
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prefill_cache_indices,
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):
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normed_hidden_states, res = self.input_layernorm(hidden_states, residual)
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# Self Attention
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attn_output = self.self_attn(
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normed_hidden_states,
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cos,
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sin,
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cu_seqlen_prefill,
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kv_cache,
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block_tables,
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slots,
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input_lengths,
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max_s,
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prefill_cache_indices,
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)
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# faster post attention rms norm
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normed_attn_res_output, attn_res = self.post_attention_layernorm(
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attn_output, res
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)
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mlp_output = self.mlp(normed_attn_res_output)
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return mlp_output, attn_res
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class Starcoder2Model(torch.nn.Module):
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def __init__(self, config, weights):
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super().__init__()
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process_group = weights.process_group
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self.tp_rank = process_group.rank()
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self.tp_world_size = process_group.size()
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self.embed_tokens = TensorParallelEmbedding(
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prefix="model.embed_tokens", weights=weights
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)
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self.layers = nn.ModuleList(
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[
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Starcoder2Layer(
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layer_id,
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config,
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weights,
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)
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for layer_id in range(config.num_hidden_layers)
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]
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)
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self.norm = STARCODER2_NORMALIZATION_CLASSES[config.norm_type].load(
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prefix="model.norm", weights=weights, eps=config.norm_epsilon
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)
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self.gradient_checkpointing = False
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self.head_size = self.layers[0].self_attn.head_size
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self.num_heads = self.layers[0].self_attn.num_heads
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self.num_key_value_heads = self.layers[0].self_attn.num_key_value_heads
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def forward(
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self,
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input_ids: torch.Tensor,
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position_ids: torch.Tensor,
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cu_seqlen_prefill: Optional[torch.Tensor],
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kv_cache: List[Tuple[torch.Tensor, torch.Tensor]],
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block_tables: torch.Tensor,
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slots: torch.Tensor,
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input_lengths: torch.Tensor,
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max_s: int,
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true_max_s: int,
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prefill_cache_indices: Optional[torch.Tensor],
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) -> torch.Tensor:
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hidden_states = self.embed_tokens(input_ids)
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# Get rotary cos and sin for this forward
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# Avoid to index in each layer
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cos, sin = self.layers[0].self_attn.rotary_emb.get_cos_sin(
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position_ids, true_max_s, hidden_states.dtype
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)
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residual = None
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for i, layer in enumerate(self.layers):
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hidden_states, residual = layer(
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hidden_states,
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residual,
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cos,
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sin,
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cu_seqlen_prefill,
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kv_cache[i],
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block_tables,
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slots,
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input_lengths,
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max_s,
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prefill_cache_indices,
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)
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hidden_states, _ = self.norm(hidden_states, residual)
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return hidden_states
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class FlashStarcoder2ForCausalLM(torch.nn.Module):
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def __init__(self, config, weights):
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super().__init__()
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self.model = Starcoder2Model(config, weights)
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try:
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self.lm_head = SpeculativeHead.load(
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config,
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prefix="lm_head",
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weights=weights,
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)
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except RuntimeError:
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self.lm_head = SpeculativeHead.load(
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config,
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prefix="model.embed_tokens",
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weights=weights,
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)
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self.max_past = config.sliding_window
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self.max_past_tensor = (
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torch.tensor(config.sliding_window, device=weights.device)
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if self.max_past is not None
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else None
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)
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def forward(
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self,
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input_ids: torch.Tensor,
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position_ids: torch.Tensor,
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cu_seqlen_prefill: Optional[torch.Tensor],
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kv_cache: List[Tuple[torch.Tensor, torch.Tensor]],
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block_tables: torch.Tensor,
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slots: torch.Tensor,
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input_lengths: torch.Tensor,
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max_s: int,
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prefill_cache_indices: Optional[torch.Tensor],
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lm_head_indices: Optional[torch.Tensor] = None,
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) -> torch.Tensor:
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true_max_s = max_s
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if prefill_cache_indices is not None:
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|
# Slots also need to be sliced as it has the same size as the whole kv tensor
|
|
slots = slots[prefill_cache_indices]
|
|
elif self.max_past is not None:
|
|
# Clamp in decode mode as paged attention requires clamped values whereas the flash attention
|
|
# kernel requires the true values
|
|
input_lengths = torch.clamp(input_lengths, max=self.max_past_tensor)
|
|
|
|
hidden_states = self.model(
|
|
input_ids,
|
|
position_ids,
|
|
cu_seqlen_prefill,
|
|
kv_cache,
|
|
block_tables,
|
|
slots,
|
|
input_lengths,
|
|
max_s,
|
|
true_max_s,
|
|
prefill_cache_indices,
|
|
)
|
|
if lm_head_indices is not None:
|
|
hidden_states = hidden_states[lm_head_indices]
|
|
logits = self.lm_head(hidden_states)
|
|
return logits
|