






"""simple docstring"""



import argparse

from . import (
    BertConfig,
    BertGenerationConfig,
    BertGenerationDecoder,
    BertGenerationEncoder,
    load_tf_weights_in_bert_generation,
    logging,
)


logging.set_verbosity_info()




def 						lowerCamelCase_				(  __A  :		Union[str, Any]			,	__A  :		int			,	__A  :		Optional[int]			,	__A  :		Any			,	__A  :		Dict			):
					# Initialise PyTorch model
					lowerCamelCase__				=BertConfig.from_pretrained(
					    'bert-large-cased'			,	vocab_size=snake_case_			,	max_position_embeddings=512			,	is_decoder=snake_case_			,	add_cross_attention=snake_case_			,	)
					lowerCamelCase__				=bert_config.to_dict()
					del bert_config_dict["type_vocab_size"]
					lowerCamelCase__				=BertGenerationConfig(**snake_case_			)
					if is_encoder:
										lowerCamelCase__				=BertGenerationEncoder(snake_case_			)
					else:
										lowerCamelCase__				=BertGenerationDecoder(snake_case_			)
					print(f"Building PyTorch model from configuration: {config}"			)

					# Load weights from tf checkpoint
					load_tf_weights_in_bert_generation(
					    snake_case_			,	snake_case_			,	model_class='bert'			,	is_encoder_named_decoder=snake_case_			,	is_encoder=snake_case_			,	)

					# Save pytorch-model
					print(f"Save PyTorch model and config to {pytorch_dump_path}"			)
					model.save_pretrained(snake_case_			)


if __name__ == "__main__":
			_snake_case       :      Optional[int]       =					argparse.ArgumentParser()
			# Required parameters
			parser.add_argument(
			    "--tf_hub_path", default=None, type=str, required=True, help="Path to the TensorFlow checkpoint path."
			)
			parser.add_argument(
			    "--pytorch_dump_path", default=None, type=str, required=True, help="Path to the output PyTorch model."
			)
			parser.add_argument(
			    "--is_encoder_named_decoder",
			    action="store_true",
			    help="If decoder has to be renamed to encoder in PyTorch model.",
			)
			parser.add_argument("--is_encoder", action="store_true", help="If model is an encoder.")
			parser.add_argument("--vocab_size", default=50_358, type=int, help="Vocab size of model")
			_snake_case       :      str       =					parser.parse_args()
			convert_tf_checkpoint_to_pytorch(
			    args.tf_hub_path,
			    args.pytorch_dump_path,
			    args.is_encoder_named_decoder,
			    args.vocab_size,
			    is_encoder=args.is_encoder,
			)







"""simple docstring"""



# Copyright (c) 2019 Uber Technologies, Inc.
#
# 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.

import argparse
import csv
import json
import math
import time

import numpy as np
import torch
import torch.optim as optim
import torch.utils.data as data
from nltk.tokenize.treebank import TreebankWordDetokenizer
from pplm_classification_head import ClassificationHead
from torch import nn
from torchtext import data as torchtext_data
from torchtext import datasets
from tqdm import tqdm, trange

from transformers import GPTaLMHeadModel, GPTaTokenizer


torch.manual_seed(0)
np.random.seed(0)
_snake_case       :      Union[str, Any]       =					1E-1_0
_snake_case       :      Union[str, Any]       =					"This is incredible! I love it, this is the best chicken I have ever had."
_snake_case       :      List[str]       =					100




class        __lowercase(       nn.Module  ):






						def __init__(					self    ,						_SCREAMING_SNAKE_CASE    ,						_SCREAMING_SNAKE_CASE="gpt2-medium"    ,						_SCREAMING_SNAKE_CASE=False    ,						_SCREAMING_SNAKE_CASE="cpu")			->  Tuple:




											"""simple docstring"""





											super().__init__()
											lowerCamelCase__				=GPTaTokenizer.from_pretrained(_SCREAMING_SNAKE_CASE)
											lowerCamelCase__				=GPTaLMHeadModel.from_pretrained(_SCREAMING_SNAKE_CASE)
											lowerCamelCase__				=self.encoder.transformer.config.hidden_size
											lowerCamelCase__				=ClassificationHead(class_size=_SCREAMING_SNAKE_CASE    ,						embed_size=self.embed_size)
											lowerCamelCase__				=cached_mode
											lowerCamelCase__				=device






						def 		lowerCAmelCase   (					self)			->  int:




											"""simple docstring"""





											return self.classifier_head






						def 		lowerCAmelCase   (					self)			->  Tuple:




											"""simple docstring"""





											for param in self.encoder.parameters():
																lowerCamelCase__				=False
											self.classifier_head.train()






						def 		lowerCAmelCase   (					self    ,						_SCREAMING_SNAKE_CASE)			->  Optional[Any]:




											"""simple docstring"""





											lowerCamelCase__				=x.ne(0).unsqueeze(2).repeat(1    ,						1    ,						self.embed_size).float().to(self.device).detach()
											lowerCamelCase__				=self.encoder.transformer(_SCREAMING_SNAKE_CASE)['last_hidden_state']
											lowerCamelCase__				=hidden * mask
											lowerCamelCase__				=torch.sum(_SCREAMING_SNAKE_CASE    ,						dim=1) / (torch.sum(_SCREAMING_SNAKE_CASE    ,						dim=1).detach() + EPSILON)
											return avg_hidden






						def 		lowerCAmelCase   (					self    ,						_SCREAMING_SNAKE_CASE)			->  Any:




											"""simple docstring"""





											if self.cached_mode:
																lowerCamelCase__				=x.to(self.device)
											else:
																lowerCamelCase__				=self.avg_representation(x.to(self.device))

											lowerCamelCase__				=self.classifier_head(_SCREAMING_SNAKE_CASE)
											lowerCamelCase__				=nn.functional.log_softmax(_SCREAMING_SNAKE_CASE    ,						dim=-1)

											return probs




class        __lowercase(       data.Dataset  ):






						def __init__(					self    ,						_SCREAMING_SNAKE_CASE    ,						_SCREAMING_SNAKE_CASE)			->  Dict:




											"""simple docstring"""





											lowerCamelCase__				=X
											lowerCamelCase__				=y






						def __len__(					self)			->  Optional[int]:




											"""simple docstring"""





											return len(self.X)






						def __getitem__(					self    ,						_SCREAMING_SNAKE_CASE)			->  Optional[Any]:




											"""simple docstring"""





											lowerCamelCase__				={}
											lowerCamelCase__				=self.X[index]
											lowerCamelCase__				=self.y[index]
											return data




def 						lowerCamelCase_				(  __A  :		List[Any]			):
					def pad_sequences(__A  :		Any			):
										lowerCamelCase__				=[len(__A			) for seq in sequences]

										lowerCamelCase__				=torch.zeros(len(__A			)			,	max(__A			)			).long()  # padding value = 0

										for i, seq in enumerate(__A			):
															lowerCamelCase__				=lengths[i]
															lowerCamelCase__				=seq[:end]

										return padded_sequences, lengths

					lowerCamelCase__				={}
					for key in data[0].keys():
										lowerCamelCase__				=[d[key] for d in data]

					lowerCamelCase__				,     lowerCamelCase__				=pad_sequences(item_info['X']			)
					lowerCamelCase__				=torch.tensor(item_info['y']			,	dtype=torch.long			)

					return x_batch, y_batch




def 						lowerCamelCase_				(  __A  :		Optional[int]			):
					lowerCamelCase__				={}
					for key in data[0].keys():
										lowerCamelCase__				=[d[key] for d in data]

					lowerCamelCase__				=torch.cat(item_info['X']			,	0			)
					lowerCamelCase__				=torch.tensor(item_info['y']			,	dtype=torch.long			)

					return x_batch, y_batch




def 						lowerCamelCase_				(  __A  :		List[Any]			,	__A  :		int			,	__A  :		str			,	__A  :		Any=0			,	__A  :		List[Any]=10			,	__A  :		Optional[Any]="cpu"			):
					lowerCamelCase__				=0
					discriminator.train_custom()
					for batch_idx, (input_t, target_t) in enumerate(__A			):
										lowerCamelCase__				,     lowerCamelCase__				=input_t.to(__A			), target_t.to(__A			)

										optimizer.zero_grad()

										lowerCamelCase__				=discriminator(__A			)
										lowerCamelCase__				=nn.functional.nll_loss(__A			,	__A			)
										loss.backward(retain_graph=__A			)
										optimizer.step()

										samples_so_far += len(__A			)

										if batch_idx % log_interval == 0:
															print(
															    'Train Epoch: {} [{}/{} ({:.0f}%)]\tLoss: {:.6f}'.format(
															        epoch + 1			,	__A			,	len(data_loader.dataset			)			,	100 * samples_so_far / len(data_loader.dataset			)			,	loss.item()			,	)			)




def 						lowerCamelCase_				(  __A  :		Dict			,	__A  :		int			,	__A  :		Any="cpu"			):
					discriminator.eval()
					lowerCamelCase__				=0
					lowerCamelCase__				=0
					with torch.no_grad():
										for input_t, target_t in data_loader:
															lowerCamelCase__				,     lowerCamelCase__				=input_t.to(__A			), target_t.to(__A			)
															lowerCamelCase__				=discriminator(__A			)
															# sum up batch loss
															test_loss += nn.functional.nll_loss(__A			,	__A			,	reduction='sum'			).item()
															# get the index of the max log-probability
															lowerCamelCase__				=output_t.argmax(dim=1			,	keepdim=__A			)
															correct += pred_t.eq(target_t.view_as(__A			)			).sum().item()

					test_loss /= len(data_loader.dataset			)

					print(
					    'Performance on test set: Average loss: {:.4f}, Accuracy: {}/{} ({:.0f}%)'.format(
					        __A			,	__A			,	len(data_loader.dataset			)			,	1_0_0.0 * correct / len(data_loader.dataset			)			)			)




def 						lowerCamelCase_				(  __A  :		Tuple			,	__A  :		Any			,	__A  :		int			,	__A  :		Optional[int]=False			,	__A  :		Any="cpu"			):
					lowerCamelCase__				=model.tokenizer.encode(__A			)
					lowerCamelCase__				=torch.tensor([input_t]			,	dtype=torch.long			,	device=__A			)
					if cached:
										lowerCamelCase__				=model.avg_representation(__A			)

					lowerCamelCase__				=model(__A			).data.cpu().numpy().flatten().tolist()
					print('Input sentence:'			,	__A			)
					print(
					    'Predictions:'			,	', '.join('{}: {:.4f}'.format(__A			,	math.exp(__A			)			) for c, log_prob in zip(__A			,	__A			)			)			,	)




def 						lowerCamelCase_				(  __A  :		List[str]			,	__A  :		str			,	__A  :		Dict			,	__A  :		List[Any]=False			,	__A  :		Any="cpu"			):
					lowerCamelCase__				=torch.utils.data.DataLoader(dataset=__A			,	batch_size=__A			,	collate_fn=__A			)

					lowerCamelCase__				=[]
					lowerCamelCase__				=[]
					for batch_idx, (x, y) in enumerate(tqdm(__A			,	ascii=__A			)			):
										with torch.no_grad():
															lowerCamelCase__				=x.to(__A			)
															lowerCamelCase__				=discriminator.avg_representation(__A			).cpu().detach()
															lowerCamelCase__				=torch.unbind(avg_rep.unsqueeze(1			)			)
															xs += avg_rep_list
															ys += y.cpu().numpy().tolist()

					lowerCamelCase__				=torch.utils.data.DataLoader(
					    dataset=Dataset(__A			,	__A			)			,	batch_size=__A			,	shuffle=__A			,	collate_fn=__A			)

					return data_loader




def 						lowerCamelCase_				(  __A  :		Union[str, Any]			,	__A  :		Any=None			,	__A  :		Union[str, Any]="gpt2-medium"			,	__A  :		Optional[int]=10			,	__A  :		Optional[Any]=64			,	__A  :		int=10			,	__A  :		Tuple=False			,	__A  :		Optional[int]=False			,	__A  :		List[Any]=False			,	):
					lowerCamelCase__				='cuda' if torch.cuda.is_available() and not no_cuda else 'cpu'

					print('Preprocessing {} dataset...'.format(__A			)			)
					lowerCamelCase__				=time.time()

					if dataset == "SST":
										lowerCamelCase__				=['positive', 'negative', 'very positive', 'very negative', 'neutral']
										lowerCamelCase__				={c: i for i, c in enumerate(__A			)}

										lowerCamelCase__				=Discriminator(
										    class_size=len(__A			)			,	pretrained_model=__A			,	cached_mode=__A			,	device=__A			).to(__A			)

										lowerCamelCase__				=torchtext_data.Field()
										lowerCamelCase__				=torchtext_data.Field(sequential=__A			)
										lowerCamelCase__				,     lowerCamelCase__				,     lowerCamelCase__				=datasets.SST.splits(
										    __A			,	__A			,	fine_grained=__A			,	train_subtrees=__A			,	)

										lowerCamelCase__				=[]
										lowerCamelCase__				=[]
										for i in trange(len(__A			)			,	ascii=__A			):
															lowerCamelCase__				=TreebankWordDetokenizer().detokenize(vars(train_data[i]			)['text']			)
															lowerCamelCase__				=discriminator.tokenizer.encode(__A			)
															lowerCamelCase__				=torch.tensor([5_0256] + seq			,	device=__A			,	dtype=torch.long			)
															x.append(__A			)
															y.append(classaidx[vars(train_data[i]			)['label']]			)
										lowerCamelCase__				=Dataset(__A			,	__A			)

										lowerCamelCase__				=[]
										lowerCamelCase__				=[]
										for i in trange(len(__A			)			,	ascii=__A			):
															lowerCamelCase__				=TreebankWordDetokenizer().detokenize(vars(test_data[i]			)['text']			)
															lowerCamelCase__				=discriminator.tokenizer.encode(__A			)
															lowerCamelCase__				=torch.tensor([5_0256] + seq			,	device=__A			,	dtype=torch.long			)
															test_x.append(__A			)
															test_y.append(classaidx[vars(test_data[i]			)['label']]			)
										lowerCamelCase__				=Dataset(__A			,	__A			)

										lowerCamelCase__				={
										    'class_size': len(__A			),
										    'embed_size': discriminator.embed_size,
										    'pretrained_model': pretrained_model,
										    'class_vocab': classaidx,
										    'default_class': 2,
										}

					elif dataset == "clickbait":
										lowerCamelCase__				=['non_clickbait', 'clickbait']
										lowerCamelCase__				={c: i for i, c in enumerate(__A			)}

										lowerCamelCase__				=Discriminator(
										    class_size=len(__A			)			,	pretrained_model=__A			,	cached_mode=__A			,	device=__A			).to(__A			)

										with open('datasets/clickbait/clickbait_train_prefix.txt'			) as f:
															lowerCamelCase__				=[]
															for i, line in enumerate(__A			):
																				try:
																									data.append(eval(__A			)			)
																				except Exception:
																									print('Error evaluating line {}: {}'.format(__A			,	__A			)			)
																									continue
										lowerCamelCase__				=[]
										lowerCamelCase__				=[]
										with open('datasets/clickbait/clickbait_train_prefix.txt'			) as f:
															for i, line in enumerate(tqdm(__A			,	ascii=__A			)			):
																				try:
																									lowerCamelCase__				=eval(__A			)
																									lowerCamelCase__				=discriminator.tokenizer.encode(d['text']			)

																									if len(__A			) < max_length_seq:
																														lowerCamelCase__				=torch.tensor([5_0256] + seq			,	device=__A			,	dtype=torch.long			)
																									else:
																														print('Line {} is longer than maximum length {}'.format(__A			,	__A			)			)
																														continue
																									x.append(__A			)
																									y.append(d['label']			)
																				except Exception:
																									print('Error evaluating / tokenizing line {}, skipping it'.format(__A			)			)
																									pass

										lowerCamelCase__				=Dataset(__A			,	__A			)
										lowerCamelCase__				=int(0.9 * len(__A			)			)
										lowerCamelCase__				=len(__A			) - train_size
										lowerCamelCase__				,     lowerCamelCase__				=torch.utils.data.random_split(__A			,	[train_size, test_size]			)

										lowerCamelCase__				={
										    'class_size': len(__A			),
										    'embed_size': discriminator.embed_size,
										    'pretrained_model': pretrained_model,
										    'class_vocab': classaidx,
										    'default_class': 1,
										}

					elif dataset == "toxic":
										lowerCamelCase__				=['non_toxic', 'toxic']
										lowerCamelCase__				={c: i for i, c in enumerate(__A			)}

										lowerCamelCase__				=Discriminator(
										    class_size=len(__A			)			,	pretrained_model=__A			,	cached_mode=__A			,	device=__A			).to(__A			)

										lowerCamelCase__				=[]
										lowerCamelCase__				=[]
										with open('datasets/toxic/toxic_train.txt'			) as f:
															for i, line in enumerate(tqdm(__A			,	ascii=__A			)			):
																				try:
																									lowerCamelCase__				=eval(__A			)
																									lowerCamelCase__				=discriminator.tokenizer.encode(d['text']			)

																									if len(__A			) < max_length_seq:
																														lowerCamelCase__				=torch.tensor([5_0256] + seq			,	device=__A			,	dtype=torch.long			)
																									else:
																														print('Line {} is longer than maximum length {}'.format(__A			,	__A			)			)
																														continue
																									x.append(__A			)
																									y.append(int(np.sum(d['label']			) > 0			)			)
																				except Exception:
																									print('Error evaluating / tokenizing line {}, skipping it'.format(__A			)			)
																									pass

										lowerCamelCase__				=Dataset(__A			,	__A			)
										lowerCamelCase__				=int(0.9 * len(__A			)			)
										lowerCamelCase__				=len(__A			) - train_size
										lowerCamelCase__				,     lowerCamelCase__				=torch.utils.data.random_split(__A			,	[train_size, test_size]			)

										lowerCamelCase__				={
										    'class_size': len(__A			),
										    'embed_size': discriminator.embed_size,
										    'pretrained_model': pretrained_model,
										    'class_vocab': classaidx,
										    'default_class': 0,
										}

					else:  # if dataset == "generic":
										# This assumes the input dataset is a TSV with the following structure:
										# class \t text

										if dataset_fp is None:
															raise ValueError('When generic dataset is selected, dataset_fp needs to be specified aswell.'			)

										lowerCamelCase__				=set()
										with open(__A			) as f:
															lowerCamelCase__				=csv.reader(__A			,	delimiter='\t'			)
															for row in tqdm(__A			,	ascii=__A			):
																				if row:
																									classes.add(row[0]			)

										lowerCamelCase__				=sorted(__A			)
										lowerCamelCase__				={c: i for i, c in enumerate(__A			)}

										lowerCamelCase__				=Discriminator(
										    class_size=len(__A			)			,	pretrained_model=__A			,	cached_mode=__A			,	device=__A			).to(__A			)

										lowerCamelCase__				=[]
										lowerCamelCase__				=[]
										with open(__A			) as f:
															lowerCamelCase__				=csv.reader(__A			,	delimiter='\t'			)
															for i, row in enumerate(tqdm(__A			,	ascii=__A			)			):
																				if row:
																									lowerCamelCase__				=row[0]
																									lowerCamelCase__				=row[1]

																									try:
																														lowerCamelCase__				=discriminator.tokenizer.encode(__A			)
																														if len(__A			) < max_length_seq:
																																			lowerCamelCase__				=torch.tensor([5_0256] + seq			,	device=__A			,	dtype=torch.long			)

																														else:
																																			print('Line {} is longer than maximum length {}'.format(__A			,	__A			)			)
																																			continue

																														x.append(__A			)
																														y.append(classaidx[label]			)

																									except Exception:
																														print('Error tokenizing line {}, skipping it'.format(__A			)			)
																														pass

										lowerCamelCase__				=Dataset(__A			,	__A			)
										lowerCamelCase__				=int(0.9 * len(__A			)			)
										lowerCamelCase__				=len(__A			) - train_size
										lowerCamelCase__				,     lowerCamelCase__				=torch.utils.data.random_split(__A			,	[train_size, test_size]			)

										lowerCamelCase__				={
										    'class_size': len(__A			),
										    'embed_size': discriminator.embed_size,
										    'pretrained_model': pretrained_model,
										    'class_vocab': classaidx,
										    'default_class': 0,
										}

					lowerCamelCase__				=time.time()
					print('Preprocessed {} data points'.format(len(__A			) + len(__A			)			)			)
					print('Data preprocessing took: {:.3f}s'.format(end - start			)			)

					if cached:
										print('Building representation cache...'			)

										lowerCamelCase__				=time.time()

										lowerCamelCase__				=get_cached_data_loader(__A			,	__A			,	__A			,	shuffle=__A			,	device=__A			)

										lowerCamelCase__				=get_cached_data_loader(__A			,	__A			,	__A			,	device=__A			)

										lowerCamelCase__				=time.time()
										print('Building representation cache took: {:.3f}s'.format(end - start			)			)

					else:
										lowerCamelCase__				=torch.utils.data.DataLoader(
										    dataset=__A			,	batch_size=__A			,	shuffle=__A			,	collate_fn=__A			)
										lowerCamelCase__				=torch.utils.data.DataLoader(dataset=__A			,	batch_size=__A			,	collate_fn=__A			)

					if save_model:
										with open('{}_classifier_head_meta.json'.format(__A			)			,	'w'			) as meta_file:
															json.dump(__A			,	__A			)

					lowerCamelCase__				=optim.Adam(discriminator.parameters()			,	lr=0.0_0_0_1			)

					for epoch in range(__A			):
										lowerCamelCase__				=time.time()
										print('\nEpoch'			,	epoch + 1			)

										train_epoch(
										    discriminator=__A			,	data_loader=__A			,	optimizer=__A			,	epoch=__A			,	log_interval=__A			,	device=__A			,	)
										evaluate_performance(data_loader=__A			,	discriminator=__A			,	device=__A			)

										lowerCamelCase__				=time.time()
										print('Epoch took: {:.3f}s'.format(end - start			)			)

										print('\nExample prediction'			)
										predict(__A			,	__A			,	__A			,	cached=__A			,	device=__A			)

										if save_model:
															# torch.save(discriminator.state_dict(),
															#           "{}_discriminator_{}.pt".format(
															#               args.dataset, epoch + 1
															#               ))
															torch.save(
															    discriminator.get_classifier().state_dict()			,	'{}_classifier_head_epoch_{}.pt'.format(__A			,	epoch + 1			)			,	)


if __name__ == "__main__":
						_snake_case       :      Dict       =					argparse.ArgumentParser(description="Train a discriminator on top of GPT-2 representations")
						parser.add_argument(
						    "--dataset",
						    type=str,
						    default="SST",
						    choices=("SST", "clickbait", "toxic", "generic"),
						    help=(
						        "dataset to train the discriminator on."
						        "In case of generic, the dataset is expected"
						        "to be a TSBV file with structure: class \\t text"
						    ),
						)
						parser.add_argument(
						    "--dataset_fp",
						    type=str,
						    default="",
						    help="File path of the dataset to use. Needed only in case of generic datadset",
						)
						parser.add_argument(
						    "--pretrained_model", type=str, default="gpt2-medium", help="Pretrained model to use as encoder"
						)
						parser.add_argument("--epochs", type=int, default=10, metavar="N", help="Number of training epochs")
						parser.add_argument(
						    "--batch_size", type=int, default=64, metavar="N", help="input batch size for training (default: 64)"
						)
						parser.add_argument(
						    "--log_interval",
						    type=int,
						    default=10,
						    metavar="N",
						    help="how many batches to wait before logging training status",
						)
						parser.add_argument("--save_model", action="store_true", help="whether to save the model")
						parser.add_argument("--cached", action="store_true", help="whether to cache the input representations")
						parser.add_argument("--no_cuda", action="store_true", help="use to turn off cuda")
						_snake_case       :      Optional[Any]       =					parser.parse_args()

						train_discriminator(**(vars(args)))