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run_generation.py
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#!/usr/bin/env python
# coding=utf-8
# Copyright 2018 Google AI, Google Brain and Carnegie Mellon University Authors and the HuggingFace Inc. team.
# Copyright (c) 2018, NVIDIA CORPORATION. All rights reserved.
#
# Licensed under the Apache License, Version 2.0 (the "License");
# you may not use this file except in compliance with the License.
# You may obtain a copy of the License at
#
# http:https://www.apache.org/licenses/LICENSE-2.0
#
# Unless required by applicable law or agreed to in writing, software
# distributed under the License is distributed on an "AS IS" BASIS,
# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
# See the License for the specific language governing permissions and
# limitations under the License.
"""Conditional text generation with the auto-regressive models of the library (GPT/GPT-2/CTRL/Transformer-XL/XLNet)"""
import argparse
import inspect
import logging
from typing import Tuple
import torch
from accelerate import PartialState
from accelerate.utils import set_seed
from transformers import (
AutoTokenizer,
BloomForCausalLM,
BloomTokenizerFast,
CTRLLMHeadModel,
CTRLTokenizer,
GenerationMixin,
GPT2LMHeadModel,
GPT2Tokenizer,
GPTJForCausalLM,
LlamaForCausalLM,
LlamaTokenizer,
OpenAIGPTLMHeadModel,
OpenAIGPTTokenizer,
OPTForCausalLM,
TransfoXLLMHeadModel,
TransfoXLTokenizer,
XLMTokenizer,
XLMWithLMHeadModel,
XLNetLMHeadModel,
XLNetTokenizer,
)
from transformers.modeling_outputs import CausalLMOutputWithPast
logging.basicConfig(
format="%(asctime)s - %(levelname)s - %(name)s - %(message)s",
datefmt="%m/%d/%Y %H:%M:%S",
level=logging.INFO,
)
logger = logging.getLogger(__name__)
MAX_LENGTH = int(10000) # Hardcoded max length to avoid infinite loop
MODEL_CLASSES = {
"gpt2": (GPT2LMHeadModel, GPT2Tokenizer),
"ctrl": (CTRLLMHeadModel, CTRLTokenizer),
"openai-gpt": (OpenAIGPTLMHeadModel, OpenAIGPTTokenizer),
"xlnet": (XLNetLMHeadModel, XLNetTokenizer),
"transfo-xl": (TransfoXLLMHeadModel, TransfoXLTokenizer),
"xlm": (XLMWithLMHeadModel, XLMTokenizer),
"gptj": (GPTJForCausalLM, AutoTokenizer),
"bloom": (BloomForCausalLM, BloomTokenizerFast),
"llama": (LlamaForCausalLM, LlamaTokenizer),
"opt": (OPTForCausalLM, GPT2Tokenizer),
}
# Padding text to help Transformer-XL and XLNet with short prompts as proposed by Aman Rusia
# in https://github.com/rusiaaman/XLNet-gen#methodology
# and https://medium.com/@amanrusia/xlnet-speaks-comparison-to-gpt-2-ea1a4e9ba39e
PREFIX = """In 1991, the remains of Russian Tsar Nicholas II and his family
(except for Alexei and Maria) are discovered.
The voice of Nicholas's young son, Tsarevich Alexei Nikolaevich, narrates the
remainder of the story. 1883 Western Siberia,
a young Grigori Rasputin is asked by his father and a group of men to perform magic.
Rasputin has a vision and denounces one of the men as a horse thief. Although his
father initially slaps him for making such an accusation, Rasputin watches as the
man is chased outside and beaten. Twenty years later, Rasputin sees a vision of
the Virgin Mary, prompting him to become a priest. Rasputin quickly becomes famous,
with people, even a bishop, begging for his blessing. <eod> </s> <eos>"""
#
# Functions to prepare models' input
#
def prepare_ctrl_input(args, _, tokenizer, prompt_text):
if args.temperature > 0.7:
logger.info("CTRL typically works better with lower temperatures (and lower top_k).")
encoded_prompt = tokenizer.encode(prompt_text, add_special_tokens=False)
if not any(encoded_prompt[0] == x for x in tokenizer.control_codes.values()):
logger.info("WARNING! You are not starting your generation from a control code so you won't get good results")
return prompt_text
def prepare_xlm_input(args, model, tokenizer, prompt_text):
# kwargs = {"language": None, "mask_token_id": None}
# Set the language
use_lang_emb = hasattr(model.config, "use_lang_emb") and model.config.use_lang_emb
if hasattr(model.config, "lang2id") and use_lang_emb:
available_languages = model.config.lang2id.keys()
if args.xlm_language in available_languages:
language = args.xlm_language
else:
language = None
while language not in available_languages:
language = input("Using XLM. Select language in " + str(list(available_languages)) + " >>> ")
model.config.lang_id = model.config.lang2id[language]
# kwargs["language"] = tokenizer.lang2id[language]
# TODO fix mask_token_id setup when configurations will be synchronized between models and tokenizers
# XLM masked-language modeling (MLM) models need masked token
# is_xlm_mlm = "mlm" in args.model_name_or_path
# if is_xlm_mlm:
# kwargs["mask_token_id"] = tokenizer.mask_token_id
return prompt_text
def prepare_xlnet_input(args, _, tokenizer, prompt_text):
prefix = args.prefix if args.prefix else args.padding_text if args.padding_text else PREFIX
prompt_text = prefix + prompt_text
return prompt_text
def prepare_transfoxl_input(args, _, tokenizer, prompt_text):
prefix = args.prefix if args.prefix else args.padding_text if args.padding_text else PREFIX
prompt_text = prefix + prompt_text
return prompt_text
PREPROCESSING_FUNCTIONS = {
"ctrl": prepare_ctrl_input,
"xlm": prepare_xlm_input,
"xlnet": prepare_xlnet_input,
"transfo-xl": prepare_transfoxl_input,
}
def adjust_length_to_model(length, max_sequence_length):
if length < 0 and max_sequence_length > 0:
length = max_sequence_length
elif 0 < max_sequence_length < length:
length = max_sequence_length # No generation bigger than model size
elif length < 0:
length = MAX_LENGTH # avoid infinite loop
return length
def sparse_model_config(model_config):
embedding_size = None
if hasattr(model_config, "hidden_size"):
embedding_size = model_config.hidden_size
elif hasattr(model_config, "n_embed"):
embedding_size = model_config.n_embed
elif hasattr(model_config, "n_embd"):
embedding_size = model_config.n_embd
num_head = None
if hasattr(model_config, "num_attention_heads"):
num_head = model_config.num_attention_heads
elif hasattr(model_config, "n_head"):
num_head = model_config.n_head
if embedding_size is None or num_head is None or num_head == 0:
raise ValueError("Check the model config")
num_embedding_size_per_head = int(embedding_size / num_head)
if hasattr(model_config, "n_layer"):
num_layer = model_config.n_layer
elif hasattr(model_config, "num_hidden_layers"):
num_layer = model_config.num_hidden_layers
else:
raise ValueError("Number of hidden layers couldn't be determined from the model config")
return num_layer, num_head, num_embedding_size_per_head
def generate_past_key_values(model, batch_size, seq_len):
num_block_layers, num_attention_heads, num_embedding_size_per_head = sparse_model_config(model.config)
if model.config.model_type == "bloom":
past_key_values = tuple(
(
torch.empty(int(num_attention_heads * batch_size), num_embedding_size_per_head, seq_len)
.to(model.dtype)
.to(model.device),
torch.empty(int(num_attention_heads * batch_size), seq_len, num_embedding_size_per_head)
.to(model.dtype)
.to(model.device),
)
for _ in range(num_block_layers)
)
else:
past_key_values = tuple(
(
torch.empty(batch_size, num_attention_heads, seq_len, num_embedding_size_per_head)
.to(model.dtype)
.to(model.device),
torch.empty(batch_size, num_attention_heads, seq_len, num_embedding_size_per_head)
.to(model.dtype)
.to(model.device),
)
for _ in range(num_block_layers)
)
return past_key_values
def prepare_jit_inputs(inputs, model, tokenizer):
batch_size = len(inputs)
dummy_input = tokenizer.batch_encode_plus(inputs, return_tensors="pt")
dummy_input = dummy_input.to(model.device)
if model.config.use_cache:
dummy_input["past_key_values"] = generate_past_key_values(model, batch_size, 1)
dummy_input["attention_mask"] = torch.cat(
[
torch.zeros(dummy_input["attention_mask"].shape[0], 1)
.to(dummy_input["attention_mask"].dtype)
.to(model.device),
dummy_input["attention_mask"],
],
-1,
)
return dummy_input
class _ModelFallbackWrapper(GenerationMixin):
__slots__ = ("_optimized", "_default")
def __init__(self, optimized, default):
self._optimized = optimized
self._default = default
def __call__(self, *args, **kwargs):
if kwargs["past_key_values"] is None and self._default.config.use_cache:
kwargs["past_key_values"] = generate_past_key_values(self._default, kwargs["input_ids"].shape[0], 0)
kwargs.pop("position_ids", None)
for k in list(kwargs.keys()):
if kwargs[k] is None or isinstance(kwargs[k], bool):
kwargs.pop(k)
outputs = self._optimized(**kwargs)
lm_logits = outputs[0]
past_key_values = outputs[1]
fixed_output = CausalLMOutputWithPast(
loss=None,
logits=lm_logits,
past_key_values=past_key_values,
hidden_states=None,
attentions=None,
)
return fixed_output
def __getattr__(self, item):
return getattr(self._default, item)
def prepare_inputs_for_generation(
self, input_ids, past_key_values=None, inputs_embeds=None, use_cache=None, **kwargs
):
return self._default.prepare_inputs_for_generation(
input_ids, past_key_values=past_key_values, inputs_embeds=inputs_embeds, use_cache=use_cache, **kwargs
)
def _reorder_cache(
self, past_key_values: Tuple[Tuple[torch.Tensor]], beam_idx: torch.Tensor
) -> Tuple[Tuple[torch.Tensor]]:
"""
This function is used to re-order the `past_key_values` cache if [`~PretrainedModel.beam_search`] or
[`~PretrainedModel.beam_sample`] is called. This is required to match `past_key_values` with the correct
beam_idx at every generation step.
"""
return self._default._reorder_cache(past_key_values, beam_idx)
def main():
parser = argparse.ArgumentParser()
parser.add_argument(
"--model_type",
default=None,
type=str,
required=True,
help="Model type selected in the list: " + ", ".join(MODEL_CLASSES.keys()),
)
parser.add_argument(
"--model_name_or_path",
default=None,
type=str,
required=True,
help="Path to pre-trained model or shortcut name selected in the list: " + ", ".join(MODEL_CLASSES.keys()),
)
parser.add_argument("--prompt", type=str, default="")
parser.add_argument("--length", type=int, default=20)
parser.add_argument("--stop_token", type=str, default=None, help="Token at which text generation is stopped")
parser.add_argument(
"--temperature",
type=float,
default=1.0,
help="temperature of 1.0 has no effect, lower tend toward greedy sampling",
)
parser.add_argument(
"--repetition_penalty", type=float, default=1.0, help="primarily useful for CTRL model; in that case, use 1.2"
)
parser.add_argument("--k", type=int, default=0)
parser.add_argument("--p", type=float, default=0.9)
parser.add_argument("--prefix", type=str, default="", help="Text added prior to input.")
parser.add_argument("--padding_text", type=str, default="", help="Deprecated, the use of `--prefix` is preferred.")
parser.add_argument("--xlm_language", type=str, default="", help="Optional language when used with the XLM model.")
parser.add_argument("--seed", type=int, default=42, help="random seed for initialization")
parser.add_argument(
"--use_cpu",
action="store_true",
help="Whether or not to use cpu. If set to False, " "we will use gpu/npu or mps device if available",
)
parser.add_argument("--num_return_sequences", type=int, default=1, help="The number of samples to generate.")
parser.add_argument(
"--fp16",
action="store_true",
help="Whether to use 16-bit (mixed) precision (through NVIDIA apex) instead of 32-bit",
)
parser.add_argument("--jit", action="store_true", help="Whether or not to use jit trace to accelerate inference")
args = parser.parse_args()
# Initialize the distributed state.
distributed_state = PartialState(cpu=args.use_cpu)
logger.warning(f"device: {distributed_state.device}, 16-bits inference: {args.fp16}")
if args.seed is not None:
set_seed(args.seed)
# Initialize the model and tokenizer
try:
args.model_type = args.model_type.lower()
model_class, tokenizer_class = MODEL_CLASSES[args.model_type]
except KeyError:
raise KeyError("the model {} you specified is not supported. You are welcome to add it and open a PR :)")
tokenizer = tokenizer_class.from_pretrained(args.model_name_or_path)
if tokenizer.pad_token is None:
tokenizer.pad_token = tokenizer.eos_token
model = model_class.from_pretrained(args.model_name_or_path)
# Set the model to the right device
model.to(distributed_state.device)
if args.fp16:
model.half()
max_seq_length = getattr(model.config, "max_position_embeddings", 0)
args.length = adjust_length_to_model(args.length, max_sequence_length=max_seq_length)
logger.info(args)
prompt_text = args.prompt if args.prompt else input("Model prompt >>> ")
# Different models need different input formatting and/or extra arguments
requires_preprocessing = args.model_type in PREPROCESSING_FUNCTIONS.keys()
if requires_preprocessing:
prepare_input = PREPROCESSING_FUNCTIONS.get(args.model_type)
preprocessed_prompt_text = prepare_input(args, model, tokenizer, prompt_text)
if model.__class__.__name__ in ["TransfoXLLMHeadModel"]:
tokenizer_kwargs = {"add_space_before_punct_symbol": True}
else:
tokenizer_kwargs = {}
encoded_prompt = tokenizer.encode(
preprocessed_prompt_text, add_special_tokens=False, return_tensors="pt", **tokenizer_kwargs
)
else:
prefix = args.prefix if args.prefix else args.padding_text
encoded_prompt = tokenizer.encode(prefix + prompt_text, add_special_tokens=False, return_tensors="pt")
encoded_prompt = encoded_prompt.to(distributed_state.device)
if encoded_prompt.size()[-1] == 0:
input_ids = None
else:
input_ids = encoded_prompt
if args.jit:
jit_input_texts = ["enable jit"]
jit_inputs = prepare_jit_inputs(jit_input_texts, model, tokenizer)
torch._C._jit_set_texpr_fuser_enabled(False)
model.config.return_dict = False
if hasattr(model, "forward"):
sig = inspect.signature(model.forward)
else:
sig = inspect.signature(model.__call__)
jit_inputs = tuple(jit_inputs[key] for key in sig.parameters if jit_inputs.get(key, None) is not None)
traced_model = torch.jit.trace(model, jit_inputs, strict=False)
traced_model = torch.jit.freeze(traced_model.eval())
traced_model(*jit_inputs)
traced_model(*jit_inputs)
model = _ModelFallbackWrapper(traced_model, model)
output_sequences = model.generate(
input_ids=input_ids,
max_length=args.length + len(encoded_prompt[0]),
temperature=args.temperature,
top_k=args.k,
top_p=args.p,
repetition_penalty=args.repetition_penalty,
do_sample=True,
num_return_sequences=args.num_return_sequences,
)
# Remove the batch dimension when returning multiple sequences
if len(output_sequences.shape) > 2:
output_sequences.squeeze_()
generated_sequences = []
for generated_sequence_idx, generated_sequence in enumerate(output_sequences):
print(f"=== GENERATED SEQUENCE {generated_sequence_idx + 1} ===")
generated_sequence = generated_sequence.tolist()
# Decode text
text = tokenizer.decode(generated_sequence, clean_up_tokenization_spaces=True)
# Remove all text after the stop token
text = text[: text.find(args.stop_token) if args.stop_token else None]
# Add the prompt at the beginning of the sequence. Remove the excess text that was used for pre-processing
total_sequence = (
prompt_text + text[len(tokenizer.decode(encoded_prompt[0], clean_up_tokenization_spaces=True)) :]
)
generated_sequences.append(total_sequence)
print(total_sequence)
return generated_sequences
if __name__ == "__main__":
main()