run_glue.py
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run_glue.py
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	#!/usr/bin/env python
	# coding=utf-8
	# Copyright 2020 The HuggingFace Inc. team. 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://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.
	""" Finetuning the library models for sequence classification on GLUE."""
	# You can also adapt this script on your own text classification task. Pointers for this are left as comments.

	import logging
	import os
	import random
	import sys
	from dataclasses import dataclass, field
	from typing import Optional

	import numpy as np
	from datasets import load_dataset, load_metric

	import transformers
	from transformers import (
	AutoConfig,
	AutoModelForSequenceClassification,
	AutoTokenizer,
	DataCollatorWithPadding,
	EvalPrediction,
	HfArgumentParser,
	PretrainedConfig,
	Trainer,
	TrainingArguments,
	default_data_collator,
	set_seed,
	)
	from transformers.trainer_utils import get_last_checkpoint, is_main_process


	task_to_keys = {
	"cola": ("sentence", None),
	"mnli": ("premise", "hypothesis"),
	"mrpc": ("sentence1", "sentence2"),
	"qnli": ("question", "sentence"),
	"qqp": ("question1", "question2"),
	"rte": ("sentence1", "sentence2"),
	"sst2": ("sentence", None),
	"stsb": ("sentence1", "sentence2"),
	"wnli": ("sentence1", "sentence2"),
	}

	logger = logging.getLogger(__name__)


	@dataclass
	class DataTrainingArguments:
	"""
	Arguments pertaining to what data we are going to input our model for training and eval.

	Using `HfArgumentParser` we can turn this class
	into argparse arguments to be able to specify them on
	the command line.
	"""

	task_name: Optional[str] = field(
	default=None,
	metadata={"help": "The name of the task to train on: " + ", ".join(task_to_keys.keys())},
	)
	max_seq_length: int = field(
	default=128,
	metadata={
	"help": "The maximum total input sequence length after tokenization. Sequences longer "
	"than this will be truncated, sequences shorter will be padded."
	},
	)
	overwrite_cache: bool = field(
	default=False, metadata={"help": "Overwrite the cached preprocessed datasets or not."}
	)
	pad_to_max_length: bool = field(
	default=True,
	metadata={
	"help": "Whether to pad all samples to `max_seq_length`. "
	"If False, will pad the samples dynamically when batching to the maximum length in the batch."
	},
	)
	max_train_samples: Optional[int] = field(
	default=None,
	metadata={
	"help": "For debugging purposes or quicker training, truncate the number of training examples to this "
	"value if set."
	},
	)
	max_val_samples: Optional[int] = field(
	default=None,
	metadata={
	"help": "For debugging purposes or quicker training, truncate the number of validation examples to this "
	"value if set."
	},
	)
	max_test_samples: Optional[int] = field(
	default=None,
	metadata={
	"help": "For debugging purposes or quicker training, truncate the number of test examples to this "
	"value if set."
	},
	)
	train_file: Optional[str] = field(
	default=None, metadata={"help": "A csv or a json file containing the training data."}
	)
	validation_file: Optional[str] = field(
	default=None, metadata={"help": "A csv or a json file containing the validation data."}
	)
	test_file: Optional[str] = field(default=None, metadata={"help": "A csv or a json file containing the test data."})

	def __post_init__(self):
	if self.task_name is not None:
	self.task_name = self.task_name.lower()
	if self.task_name not in task_to_keys.keys():
	raise ValueError("Unknown task, you should pick one in " + ",".join(task_to_keys.keys()))
	elif self.train_file is None or self.validation_file is None:
	raise ValueError("Need either a GLUE task or a training/validation file.")
	else:
	train_extension = self.train_file.split(".")[-1]
	assert train_extension in ["csv", "json"], "`train_file` should be a csv or a json file."
	validation_extension = self.validation_file.split(".")[-1]
	assert (
	validation_extension == train_extension
	), "`validation_file` should have the same extension (csv or json) as `train_file`."


	@dataclass
	class ModelArguments:
	"""
	Arguments pertaining to which model/config/tokenizer we are going to fine-tune from.
	"""

	model_name_or_path: str = field(
	metadata={"help": "Path to pretrained model or model identifier from huggingface.co/models"}
	)
	config_name: Optional[str] = field(
	default=None, metadata={"help": "Pretrained config name or path if not the same as model_name"}
	)
	tokenizer_name: Optional[str] = field(
	default=None, metadata={"help": "Pretrained tokenizer name or path if not the same as model_name"}
	)
	cache_dir: Optional[str] = field(
	default=None,
	metadata={"help": "Where do you want to store the pretrained models downloaded from huggingface.co"},
	)
	use_fast_tokenizer: bool = field(
	default=True,
	metadata={"help": "Whether to use one of the fast tokenizer (backed by the tokenizers library) or not."},
	)
	model_revision: str = field(
	default="main",
	metadata={"help": "The specific model version to use (can be a branch name, tag name or commit id)."},
	)
	use_auth_token: bool = field(
	default=False,
	metadata={
	"help": "Will use the token generated when running `transformers-cli login` (necessary to use this script "
	"with private models)."
	},
	)


	def main():
	# See all possible arguments in src/transformers/training_args.py
	# or by passing the --help flag to this script.
	# We now keep distinct sets of args, for a cleaner separation of concerns.

	parser = HfArgumentParser((ModelArguments, DataTrainingArguments, TrainingArguments))
	if len(sys.argv) == 2 and sys.argv[1].endswith(".json"):
	# If we pass only one argument to the script and it's the path to a json file,
	# let's parse it to get our arguments.
	model_args, data_args, training_args = parser.parse_json_file(json_file=os.path.abspath(sys.argv[1]))
	else:
	model_args, data_args, training_args = parser.parse_args_into_dataclasses()

	# Detecting last checkpoint.
	last_checkpoint = None
	if os.path.isdir(training_args.output_dir) and training_args.do_train and not training_args.overwrite_output_dir:
	last_checkpoint = get_last_checkpoint(training_args.output_dir)
	if last_checkpoint is None and len(os.listdir(training_args.output_dir)) > 0:
	raise ValueError(
	f"Output directory ({training_args.output_dir}) already exists and is not empty. "
	"Use --overwrite_output_dir to overcome."
	)
	elif last_checkpoint is not None:
	logger.info(
	f"Checkpoint detected, resuming training at {last_checkpoint}. To avoid this behavior, change "
	"the `--output_dir` or add `--overwrite_output_dir` to train from scratch."
	)

	# Setup logging
	logging.basicConfig(
	format="%(asctime)s - %(levelname)s - %(name)s - %(message)s",
	datefmt="%m/%d/%Y %H:%M:%S",
	handlers=[logging.StreamHandler(sys.stdout)],
	)
	logger.setLevel(logging.INFO if is_main_process(training_args.local_rank) else logging.WARN)

	# Log on each process the small summary:
	logger.warning(
	f"Process rank: {training_args.local_rank}, device: {training_args.device}, n_gpu: {training_args.n_gpu}"
	+ f"distributed training: {bool(training_args.local_rank != -1)}, 16-bits training: {training_args.fp16}"
	)
	# Set the verbosity to info of the Transformers logger (on main process only):
	if is_main_process(training_args.local_rank):
	transformers.utils.logging.set_verbosity_info()
	transformers.utils.logging.enable_default_handler()
	transformers.utils.logging.enable_explicit_format()
	logger.info(f"Training/evaluation parameters {training_args}")

	# Set seed before initializing model.
	set_seed(training_args.seed)

	# Get the datasets: you can either provide your own CSV/JSON training and evaluation files (see below)
	# or specify a GLUE benchmark task (the dataset will be downloaded automatically from the datasets Hub).
	#
	# For CSV/JSON files, this script will use as labels the column called 'label' and as pair of sentences the
	# sentences in columns called 'sentence1' and 'sentence2' if such column exists or the first two columns not named
	# label if at least two columns are provided.
	#
	# If the CSVs/JSONs contain only one non-label column, the script does single sentence classification on this
	# single column. You can easily tweak this behavior (see below)
	#
	# In distributed training, the load_dataset function guarantee that only one local process can concurrently
	# download the dataset.
	if data_args.task_name is not None:
	# Downloading and loading a dataset from the hub.
	datasets = load_dataset("glue", data_args.task_name)
	else:
	# Loading a dataset from your local files.
	# CSV/JSON training and evaluation files are needed.
	data_files = {"train": data_args.train_file, "validation": data_args.validation_file}

	# Get the test dataset: you can provide your own CSV/JSON test file (see below)
	# when you use `do_predict` without specifying a GLUE benchmark task.
	if training_args.do_predict:
	if data_args.test_file is not None:
	train_extension = data_args.train_file.split(".")[-1]
	test_extension = data_args.test_file.split(".")[-1]
	assert (
	test_extension == train_extension
	), "`test_file` should have the same extension (csv or json) as `train_file`."
	data_files["test"] = data_args.test_file
	else:
	raise ValueError("Need either a GLUE task or a test file for `do_predict`.")

	for key in data_files.keys():
	logger.info(f"load a local file for {key}: {data_files[key]}")

	if data_args.train_file.endswith(".csv"):
	# Loading a dataset from local csv files
	datasets = load_dataset("csv", data_files=data_files)
	else:
	# Loading a dataset from local json files
	datasets = load_dataset("json", data_files=data_files)
	# See more about loading any type of standard or custom dataset at
	# https://huggingface.co/docs/datasets/loading_datasets.html.

	# Labels
	if data_args.task_name is not None:
	is_regression = data_args.task_name == "stsb"
	if not is_regression:
	label_list = datasets["train"].features["label"].names
	num_labels = len(label_list)
	else:
	num_labels = 1
	else:
	# Trying to have good defaults here, don't hesitate to tweak to your needs.
	is_regression = datasets["train"].features["label"].dtype in ["float32", "float64"]
	if is_regression:
	num_labels = 1
	else:
	# A useful fast method:
	# https://huggingface.co/docs/datasets/package_reference/main_classes.html#datasets.Dataset.unique
	label_list = datasets["train"].unique("label")
	label_list.sort() # Let's sort it for determinism
	num_labels = len(label_list)

	# Load pretrained model and tokenizer
	#
	# In distributed training, the .from_pretrained methods guarantee that only one local process can concurrently
	# download model & vocab.
	config = AutoConfig.from_pretrained(
	model_args.config_name if model_args.config_name else model_args.model_name_or_path,
	num_labels=num_labels,
	finetuning_task=data_args.task_name,
	cache_dir=model_args.cache_dir,
	revision=model_args.model_revision,
	use_auth_token=True if model_args.use_auth_token else None,
	)
	tokenizer = AutoTokenizer.from_pretrained(
	model_args.tokenizer_name if model_args.tokenizer_name else model_args.model_name_or_path,
	cache_dir=model_args.cache_dir,
	use_fast=model_args.use_fast_tokenizer,
	revision=model_args.model_revision,
	use_auth_token=True if model_args.use_auth_token else None,
	)
	model = AutoModelForSequenceClassification.from_pretrained(
	model_args.model_name_or_path,
	from_tf=bool(".ckpt" in model_args.model_name_or_path),
	config=config,
	cache_dir=model_args.cache_dir,
	revision=model_args.model_revision,
	use_auth_token=True if model_args.use_auth_token else None,
	)

	# Preprocessing the datasets
	if data_args.task_name is not None:
	sentence1_key, sentence2_key = task_to_keys[data_args.task_name]
	else:
	# Again, we try to have some nice defaults but don't hesitate to tweak to your use case.
	non_label_column_names = [name for name in datasets["train"].column_names if name != "label"]
	if "sentence1" in non_label_column_names and "sentence2" in non_label_column_names:
	sentence1_key, sentence2_key = "sentence1", "sentence2"
	else:
	if len(non_label_column_names) >= 2:
	sentence1_key, sentence2_key = non_label_column_names[:2]
	else:
	sentence1_key, sentence2_key = non_label_column_names[0], None

	# Padding strategy
	if data_args.pad_to_max_length:
	padding = "max_length"
	else:
	# We will pad later, dynamically at batch creation, to the max sequence length in each batch
	padding = False

	# Some models have set the order of the labels to use, so let's make sure we do use it.
	label_to_id = None
	if (
	model.config.label2id != PretrainedConfig(num_labels=num_labels).label2id
	and data_args.task_name is not None
	and not is_regression
	):
	# Some have all caps in their config, some don't.
	label_name_to_id = {k.lower(): v for k, v in model.config.label2id.items()}
	if list(sorted(label_name_to_id.keys())) == list(sorted(label_list)):
	label_to_id = {i: int(label_name_to_id[label_list[i]]) for i in range(num_labels)}
	else:
	logger.warn(
	"Your model seems to have been trained with labels, but they don't match the dataset: ",
	f"model labels: {list(sorted(label_name_to_id.keys()))}, dataset labels: {list(sorted(label_list))}."
	"\nIgnoring the model labels as a result.",
	)
	elif data_args.task_name is None and not is_regression:
	label_to_id = {v: i for i, v in enumerate(label_list)}

	if data_args.max_seq_length > tokenizer.model_max_length:
	logger.warn(
	f"The max_seq_length passed ({data_args.max_seq_length}) is larger than the maximum length for the"
	f"model ({tokenizer.model_max_length}). Using max_seq_length={tokenizer.model_max_length}."
	)
	max_seq_length = min(data_args.max_seq_length, tokenizer.model_max_length)

	def preprocess_function(examples):
	# Tokenize the texts
	args = (
	(examples[sentence1_key],) if sentence2_key is None else (examples[sentence1_key], examples[sentence2_key])
	)
	result = tokenizer(*args, padding=padding, max_length=max_seq_length, truncation=True)

	# Map labels to IDs (not necessary for GLUE tasks)
	if label_to_id is not None and "label" in examples:
	result["label"] = [(label_to_id[l] if l != -1 else -1) for l in examples["label"]]
	return result

	datasets = datasets.map(preprocess_function, batched=True, load_from_cache_file=not data_args.overwrite_cache)
	if training_args.do_train:
	if "train" not in datasets:
	raise ValueError("--do_train requires a train dataset")
	train_dataset = datasets["train"]
	if data_args.max_train_samples is not None:
	train_dataset = train_dataset.select(range(data_args.max_train_samples))

	if training_args.do_eval:
	if "validation" not in datasets and "validation_matched" not in datasets:
	raise ValueError("--do_eval requires a validation dataset")
	eval_dataset = datasets["validation_matched" if data_args.task_name == "mnli" else "validation"]
	if data_args.max_val_samples is not None:
	eval_dataset = eval_dataset.select(range(data_args.max_val_samples))

	if training_args.do_predict or data_args.task_name is not None or data_args.test_file is not None:
	if "test" not in datasets and "test_matched" not in datasets:
	raise ValueError("--do_predict requires a test dataset")
	test_dataset = datasets["test_matched" if data_args.task_name == "mnli" else "test"]
	if data_args.max_test_samples is not None:
	test_dataset = test_dataset.select(range(data_args.max_test_samples))

	# Log a few random samples from the training set:
	if training_args.do_train:
	for index in random.sample(range(len(train_dataset)), 3):
	logger.info(f"Sample {index} of the training set: {train_dataset[index]}.")

	# Get the metric function
	if data_args.task_name is not None:
	metric = load_metric("glue", data_args.task_name)
	# TODO: When datasets metrics include regular accuracy, make an else here and remove special branch from
	# compute_metrics

	# You can define your custom compute_metrics function. It takes an `EvalPrediction` object (a namedtuple with a
	# predictions and label_ids field) and has to return a dictionary string to float.
	def compute_metrics(p: EvalPrediction):
	preds = p.predictions[0] if isinstance(p.predictions, tuple) else p.predictions
	preds = np.squeeze(preds) if is_regression else np.argmax(preds, axis=1)
	if data_args.task_name is not None:
	result = metric.compute(predictions=preds, references=p.label_ids)
	if len(result) > 1:
	result["combined_score"] = np.mean(list(result.values())).item()
	return result
	elif is_regression:
	return {"mse": ((preds - p.label_ids) ** 2).mean().item()}
	else:
	return {"accuracy": (preds == p.label_ids).astype(np.float32).mean().item()}

	# Data collator will default to DataCollatorWithPadding, so we change it if we already did the padding.
	if data_args.pad_to_max_length:
	data_collator = default_data_collator
	elif training_args.fp16:
	data_collator = DataCollatorWithPadding(tokenizer, pad_to_multiple_of=8)
	else:
	data_collator = None

	# Initialize our Trainer
	trainer = Trainer(
	model=model,
	args=training_args,
	train_dataset=train_dataset if training_args.do_train else None,
	eval_dataset=eval_dataset if training_args.do_eval else None,
	compute_metrics=compute_metrics,
	tokenizer=tokenizer,
	data_collator=data_collator,
	)

	# Training
	if training_args.do_train:
	checkpoint = None
	if last_checkpoint is not None:
	checkpoint = last_checkpoint
	elif os.path.isdir(model_args.model_name_or_path):
	# Check the config from that potential checkpoint has the right number of labels before using it as a
	# checkpoint.
	if AutoConfig.from_pretrained(model_args.model_name_or_path).num_labels == num_labels:
	checkpoint = model_args.model_name_or_path

	train_result = trainer.train(resume_from_checkpoint=checkpoint)
	metrics = train_result.metrics
	max_train_samples = (
	data_args.max_train_samples if data_args.max_train_samples is not None else len(train_dataset)
	)
	metrics["train_samples"] = min(max_train_samples, len(train_dataset))

	trainer.save_model() # Saves the tokenizer too for easy upload

	trainer.log_metrics("train", metrics)
	trainer.save_metrics("train", metrics)
	trainer.save_state()

	# Evaluation
	if training_args.do_eval:
	logger.info("* Evaluate *")

	# Loop to handle MNLI double evaluation (matched, mis-matched)
	tasks = [data_args.task_name]
	eval_datasets = [eval_dataset]
	if data_args.task_name == "mnli":
	tasks.append("mnli-mm")
	eval_datasets.append(datasets["validation_mismatched"])

	for eval_dataset, task in zip(eval_datasets, tasks):
	metrics = trainer.evaluate(eval_dataset=eval_dataset)

	max_val_samples = data_args.max_val_samples if data_args.max_val_samples is not None else len(eval_dataset)
	metrics["eval_samples"] = min(max_val_samples, len(eval_dataset))

	trainer.log_metrics("eval", metrics)
	trainer.save_metrics("eval", metrics)

	if training_args.do_predict:
	logger.info("* Test *")

	# Loop to handle MNLI double evaluation (matched, mis-matched)
	tasks = [data_args.task_name]
	test_datasets = [test_dataset]
	if data_args.task_name == "mnli":
	tasks.append("mnli-mm")
	test_datasets.append(datasets["test_mismatched"])

	for test_dataset, task in zip(test_datasets, tasks):
	# Removing the `label` columns because it contains -1 and Trainer won't like that.
	test_dataset.remove_columns_("label")
	predictions = trainer.predict(test_dataset=test_dataset).predictions
	predictions = np.squeeze(predictions) if is_regression else np.argmax(predictions, axis=1)

	output_test_file = os.path.join(training_args.output_dir, f"test_results_{task}.txt")
	if trainer.is_world_process_zero():
	with open(output_test_file, "w") as writer:
	logger.info(f"*** Test results {task} ***")
	writer.write("index\tprediction\n")
	for index, item in enumerate(predictions):
	if is_regression:
	writer.write(f"{index}\t{item:3.3f}\n")
	else:
	item = label_list[item]
	writer.write(f"{index}\t{item}\n")


	def _mp_fn(index):
	# For xla_spawn (TPUs)
	main()


	if __name__ == "__main__":
	main()

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