259 lines
9.7 KiB
Python
259 lines
9.7 KiB
Python
import torch
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import torch.distributed
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from typing import List, Optional, Tuple
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from accelerate import init_empty_weights
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from safetensors import safe_open
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from transformers import (
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AutoTokenizer,
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AutoModelForSeq2SeqLM,
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AutoConfig,
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)
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from transformers.models.t5.parallel_layers import (
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TensorParallelColumnLinear,
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TensorParallelEmbedding,
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TensorParallelRowLinear,
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)
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from text_generation_server.models import Seq2SeqLM
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from text_generation_server.utils import (
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initialize_torch_distributed,
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weight_files,
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)
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HAS_BITS_AND_BYTES = True
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try:
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import bitsandbytes as bnb
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from bitsandbytes.nn import Int8Params
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except Exception as e:
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HAS_BITS_AND_BYTES = False
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class T5Sharded(Seq2SeqLM):
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def __init__(
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self, model_id: str, revision: Optional[str] = None, quantize: bool = False
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):
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self.process_group, rank, world_size = initialize_torch_distributed()
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self.master = rank == 0
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if torch.cuda.is_available():
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device = torch.device(f"cuda:{rank}")
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dtype = torch.float16
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else:
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device = torch.device("cpu")
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dtype = torch.float32
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tokenizer = AutoTokenizer.from_pretrained(
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model_id, revision=revision, padding_side="left", truncation_side="left"
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)
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config = AutoConfig.from_pretrained(
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model_id, revision=revision, tp_parallel=True
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)
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tokenizer.bos_token_id = config.decoder_start_token_id
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torch.distributed.barrier(group=self.process_group)
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filenames = weight_files(model_id, revision=revision, extension=".safetensors")
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with init_empty_weights():
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model = AutoModelForSeq2SeqLM.from_config(config)
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torch.distributed.barrier(group=self.process_group)
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self.load_weights(
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model,
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filenames,
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quantize=quantize,
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device=device,
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dtype=dtype,
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rank=rank,
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world_size=world_size,
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)
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self.model = model.eval()
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torch.distributed.barrier(group=self.process_group)
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super(Seq2SeqLM, self).__init__(
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tokenizer=tokenizer,
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requires_padding=True,
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dtype=dtype,
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device=device,
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rank=rank,
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world_size=world_size,
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)
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@staticmethod
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def load_weights(
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model,
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filenames: List[str],
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quantize: bool,
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device: torch.device,
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dtype: torch.dtype,
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rank: int,
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world_size: int,
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):
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parameters = dict(model.named_parameters())
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for file in filenames:
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with safe_open(
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file, framework="pt", device=str(device) if not quantize else "cpu"
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) as f:
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for name in f.keys():
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module_name, param_name = name.rsplit(".", 1)
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module = model.get_submodule(module_name)
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current_parameter_tensor = parameters.get(name, None)
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slice_ = f.get_slice(name)
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if isinstance(module, TensorParallelColumnLinear):
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size = slice_.get_shape()[0]
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block_size = size // world_size
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start = rank * block_size
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stop = (rank + 1) * block_size
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tensor = slice_[start:stop]
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elif isinstance(module, TensorParallelRowLinear):
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if param_name == "weight":
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size = slice_.get_shape()[1]
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block_size = size // world_size
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start = rank * block_size
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stop = (rank + 1) * block_size
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tensor = slice_[:, start:stop]
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else:
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tensor = slice_[:]
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# XXX: Hack for Rowlinear to add the bias only once.
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if rank != 0:
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tensor = torch.zeros_like(tensor)
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elif isinstance(module, TensorParallelEmbedding):
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size = slice_.get_shape()[0]
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block_size = size // world_size
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start = rank * block_size
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stop = (rank + 1) * block_size
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tensor = slice_[start:stop]
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elif name == "lm_head.weight":
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size = slice_.get_shape()[0]
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block_size = size // world_size
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start = rank * block_size
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stop = (rank + 1) * block_size
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tensor = slice_[start:stop]
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elif "relative_attention_bias.weight" in name:
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size = slice_.get_shape()[1]
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block_size = size // world_size
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start = rank * block_size
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stop = (rank + 1) * block_size
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tensor = slice_[:, start:stop]
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else:
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try:
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tensor = slice_[:]
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except:
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tensor = f.get_tensor(name)
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if (
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current_parameter_tensor is not None
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and current_parameter_tensor.shape != tensor.shape
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):
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raise ValueError(
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f"Name {name} -- Current {current_parameter_tensor.shape} and got {tensor.shape}"
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)
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tensor = tensor.contiguous().to(dtype)
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if quantize:
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if not HAS_BITS_AND_BYTES:
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raise ImportError(
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"bitsandbytes is not available on your machine either because it is not installed "
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"or you don't have a GPU.\n"
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"You can install it with `pip install bitsandbytes`."
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)
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if (
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type(module)
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in [TensorParallelRowLinear, TensorParallelColumnLinear]
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and param_name == "weight"
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):
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tensor = Int8Params(
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tensor,
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has_fp16_weights=False,
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requires_grad=False,
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).to(device)
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state = bnb.MatmulLtState()
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state.threshold = 6.0
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state.has_fp16_weights = False
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state.memory_efficient_backward = False
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state.use_pool = True
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state.CB = tensor.CB
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state.SCB = tensor.SCB
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tensor.CB = None
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tensor.SCB = None
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def replace_linear(state):
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def linear(input, weight, bias):
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out = bnb.matmul(
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input,
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weight,
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state=state,
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threshold=state.threshold,
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bias=bias,
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)
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if state.CB is not None:
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# we converted 8-bit row major to turing/ampere format
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# in the first inference pass
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# we no longer need the row-major weight
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del state.CB
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weight.data = state.CxB
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return out
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return linear
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module.linear = replace_linear(state)
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else:
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tensor = tensor.to(device)
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if current_parameter_tensor is not None:
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module._parameters[param_name] = tensor
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else:
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module._buffers[param_name] = tensor
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uninitialized_parameters = []
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for n, p in model.named_parameters():
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if p.data.device == torch.device("meta"):
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uninitialized_parameters.append(n)
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if uninitialized_parameters:
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raise RuntimeError(
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f"found uninitialized parameters in model: {uninitialized_parameters}"
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)
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def forward(
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self,
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input_ids,
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attention_mask,
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decoder_input_ids,
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decoder_attention_mask: Optional,
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encoder_last_hidden_state: Optional,
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past_key_values: Optional = None,
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) -> Tuple[
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torch.Tensor,
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torch.Tensor,
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List[Tuple[torch.Tensor, torch.Tensor, torch.Tensor, torch.Tensor]],
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]:
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# Model Forward
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outputs = self.model.forward(
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input_ids=input_ids,
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attention_mask=attention_mask,
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decoder_input_ids=decoder_input_ids,
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decoder_attention_mask=decoder_attention_mask,
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encoder_outputs=encoder_last_hidden_state,
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past_key_values=past_key_values,
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use_cache=True,
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)
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# Logits are sharded, so we need to gather them
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logits = [torch.empty_like(outputs.logits) for _ in range(self.world_size)]
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torch.distributed.all_gather(logits, outputs.logits, group=self.process_group)
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logits = torch.cat(logits, dim=2)
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return (
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logits,
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outputs.encoder_last_hidden_state,
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outputs.past_key_values,
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)
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