



import argparse
import logging
import os
from datetime import datetime

import numpy as np
import torch
from torch import nn
from torch.utils.data import DataLoader, SequentialSampler, Subset
from torch.utils.data.distributed import DistributedSampler
from tqdm import tqdm

import transformers
from transformers import (
    AutoConfig,
    AutoModelForSequenceClassification,
    AutoTokenizer,
    GlueDataset,
    default_data_collator,
    glue_compute_metrics,
    glue_output_modes,
    glue_processors,
    set_seed,
)
from transformers.trainer_utils import is_main_process


UpperCAmelCase				:							Optional[int]								=logging.getLogger(__name__)



def 				_lowerCAmelCase      (_lowerCAmelCase):
					UpperCamelCase_											=				p * torch.log(__A)
					UpperCamelCase_											=				0
					return -plogp.sum(dim=-1)



def 				_lowerCAmelCase      (_lowerCAmelCase):
					logger.info("lv, h >\t" + "\t".join(f"""{x + 1}""" for x in range(len(__A))))
					for row in range(len(__A)):
										if tensor.dtype != torch.long:
															logger.info(f"""layer {row + 1}:\t""" + "\t".join(f"""{x:.5f}""" for x in tensor[row].cpu().data))
										else:
															logger.info(f"""layer {row + 1}:\t""" + "\t".join(f"""{x:d}""" for x in tensor[row].cpu().data))



def 				_lowerCAmelCase      (_lowerCAmelCase				,		_lowerCAmelCase				,		_lowerCAmelCase				,		_lowerCAmelCase=True				,		_lowerCAmelCase=True				,		_lowerCAmelCase=None				,		_lowerCAmelCase=False):
					UpperCamelCase_					,      UpperCamelCase_											=				model.config.num_hidden_layers, model.config.num_attention_heads
					UpperCamelCase_											=				torch.zeros(__A				,		__A).to(args.device)
					UpperCamelCase_											=				torch.zeros(__A				,		__A).to(args.device)

					if head_mask is None:
										UpperCamelCase_											=				torch.ones(__A				,		__A).to(args.device)

					head_mask.requires_grad_(requires_grad=__A)
					# If actually pruned attention multi-head, set head mask to None to avoid shape mismatch
					if actually_pruned:
										UpperCamelCase_											=				None

					UpperCamelCase_											=				None
					UpperCamelCase_											=				None
					UpperCamelCase_											=				0.0

					for step, inputs in enumerate(tqdm(__A				,		desc="Iteration"				,		disable=args.local_rank not in [-1, 0])):
										for k, v in inputs.items():
															UpperCamelCase_											=				v.to(args.device)

										# Do a forward pass (not with torch.no_grad() since we need gradients for importance score - see below)
										UpperCamelCase_											=				model(**__A				,		head_mask=__A)
										UpperCamelCase_					,      UpperCamelCase_					,      UpperCamelCase_											=				(
										    outputs[0],
										    outputs[1],
										    outputs[-1],
										)  # Loss and logits are the first, attention the last
										loss.backward()  # Backpropagate to populate the gradients in the head mask

										if compute_entropy:
															for layer, attn in enumerate(__A):
																				UpperCamelCase_											=				entropy(attn.detach()) * inputs["attention_mask"].float().unsqueeze(1)
																				attn_entropy[layer] += masked_entropy.sum(-1).sum(0).detach()

										if compute_importance:
															head_importance += head_mask.grad.abs().detach()

										# Also store our logits/labels if we want to compute metrics afterwards
										if preds is None:
															UpperCamelCase_											=				logits.detach().cpu().numpy()
															UpperCamelCase_											=				inputs["labels"].detach().cpu().numpy()
										else:
															UpperCamelCase_											=				np.append(__A				,		logits.detach().cpu().numpy()				,		axis=0)
															UpperCamelCase_											=				np.append(__A				,		inputs["labels"].detach().cpu().numpy()				,		axis=0)

										tot_tokens += inputs["attention_mask"].float().detach().sum().data

					# Normalize
					attn_entropy /= tot_tokens
					head_importance /= tot_tokens
					# Layerwise importance normalization
					if not args.dont_normalize_importance_by_layer:
										UpperCamelCase_											=				2
										UpperCamelCase_											=				torch.pow(torch.pow(__A				,		__A).sum(-1)				,		1 / exponent)
										head_importance /= norm_by_layer.unsqueeze(-1) + 1e-20

					if not args.dont_normalize_global_importance:
										UpperCamelCase_											=				(head_importance - head_importance.min()) / (head_importance.max() - head_importance.min())

					# Print/save matrices
					np.save(os.path.join(args.output_dir				,		"attn_entropy.npy")				,		attn_entropy.detach().cpu().numpy())
					np.save(os.path.join(args.output_dir				,		"head_importance.npy")				,		head_importance.detach().cpu().numpy())

					logger.info("Attention entropies")
					print_ad_tensor(__A)
					logger.info("Head importance scores")
					print_ad_tensor(__A)
					logger.info("Head ranked by importance scores")
					UpperCamelCase_											=				torch.zeros(head_importance.numel()				,		dtype=torch.long				,		device=args.device)
					UpperCamelCase_											=				torch.arange(
					    head_importance.numel()				,		device=args.device)
					UpperCamelCase_											=				head_ranks.view_as(__A)
					print_ad_tensor(__A)

					return attn_entropy, head_importance, preds, labels



def 				_lowerCAmelCase      (_lowerCAmelCase				,		_lowerCAmelCase				,		_lowerCAmelCase):
					UpperCamelCase_					,      UpperCamelCase_					,      UpperCamelCase_					,      UpperCamelCase_											=				compute_heads_importance(__A				,		__A				,		__A				,		compute_entropy=__A)
					UpperCamelCase_											=				np.argmax(__A				,		axis=1) if args.output_mode == "classification" else np.squeeze(__A)
					UpperCamelCase_											=				glue_compute_metrics(args.task_name				,		__A				,		__A)[args.metric_name]
					logger.info("Pruning: original score: %f, threshold: %f"				,		__A				,		original_score * args.masking_threshold)

					UpperCamelCase_											=				torch.ones_like(__A)
					UpperCamelCase_											=				max(1				,		int(new_head_mask.numel() * args.masking_amount))

					UpperCamelCase_											=				original_score
					while current_score >= original_score * args.masking_threshold:
										UpperCamelCase_											=				new_head_mask.clone()  # save current head mask
										# heads from least important to most - keep only not-masked heads
										UpperCamelCase_											=				float("Inf")
										UpperCamelCase_											=				head_importance.view(-1).sort()[1]

										if len(__A) <= num_to_mask:
															break

										# mask heads
										UpperCamelCase_											=				current_heads_to_mask[:num_to_mask]
										logger.info("Heads to mask: %s"				,		str(current_heads_to_mask.tolist()))
										UpperCamelCase_											=				new_head_mask.view(-1)
										UpperCamelCase_											=				0.0
										UpperCamelCase_											=				new_head_mask.view_as(__A)
										UpperCamelCase_											=				new_head_mask.clone().detach()
										print_ad_tensor(__A)

										# Compute metric and head importance again
										UpperCamelCase_					,      UpperCamelCase_					,      UpperCamelCase_					,      UpperCamelCase_											=				compute_heads_importance(
										    __A				,		__A				,		__A				,		compute_entropy=__A				,		head_mask=__A)
										UpperCamelCase_											=				np.argmax(__A				,		axis=1) if args.output_mode == "classification" else np.squeeze(__A)
										UpperCamelCase_											=				glue_compute_metrics(args.task_name				,		__A				,		__A)[args.metric_name]
										logger.info(
										    "Masking: current score: %f, remaining heads %d (%.1f percents)"				,		__A				,		new_head_mask.sum()				,		new_head_mask.sum() / new_head_mask.numel() * 1_00				,		)

					logger.info("Final head mask")
					print_ad_tensor(__A)
					np.save(os.path.join(args.output_dir				,		"head_mask.npy")				,		head_mask.detach().cpu().numpy())

					return head_mask



def 				_lowerCAmelCase      (_lowerCAmelCase				,		_lowerCAmelCase				,		_lowerCAmelCase				,		_lowerCAmelCase):
					UpperCamelCase_											=				datetime.now()
					UpperCamelCase_					,      UpperCamelCase_					,      UpperCamelCase_					,      UpperCamelCase_											=				compute_heads_importance(
					    __A				,		__A				,		__A				,		compute_entropy=__A				,		compute_importance=__A				,		head_mask=__A)
					UpperCamelCase_											=				np.argmax(__A				,		axis=1) if args.output_mode == "classification" else np.squeeze(__A)
					UpperCamelCase_											=				glue_compute_metrics(args.task_name				,		__A				,		__A)[args.metric_name]
					UpperCamelCase_											=				datetime.now() - before_time

					UpperCamelCase_											=				sum(p.numel() for p in model.parameters())
					UpperCamelCase_											=				{
					    layer: (1 - head_mask[layer].long()).nonzero().squeeze().tolist() for layer in range(len(__A))
					}

					assert sum(len(__A) for h in heads_to_prune.values()) == (1 - head_mask.long()).sum().item()
					model.prune_heads(__A)
					UpperCamelCase_											=				sum(p.numel() for p in model.parameters())

					UpperCamelCase_											=				datetime.now()
					UpperCamelCase_					,      UpperCamelCase_					,      UpperCamelCase_					,      UpperCamelCase_											=				compute_heads_importance(
					    __A				,		__A				,		__A				,		compute_entropy=__A				,		compute_importance=__A				,		head_mask=__A				,		actually_pruned=__A				,		)
					UpperCamelCase_											=				np.argmax(__A				,		axis=1) if args.output_mode == "classification" else np.squeeze(__A)
					UpperCamelCase_											=				glue_compute_metrics(args.task_name				,		__A				,		__A)[args.metric_name]
					UpperCamelCase_											=				datetime.now() - before_time

					logger.info(
					    "Pruning: original num of params: %.2e, after pruning %.2e (%.1f percents)"				,		__A				,		__A				,		pruned_num_params / original_num_params * 1_00				,		)
					logger.info("Pruning: score with masking: %f score with pruning: %f"				,		__A				,		__A)
					logger.info("Pruning: speed ratio (new timing / original timing): %f percents"				,		original_time / new_time * 1_00)



def 				_lowerCAmelCase      ():
					UpperCamelCase_											=				argparse.ArgumentParser()
					# Required parameters
					parser.add_argument(
					    "--data_dir"				,		default=__A				,		type=__A				,		required=__A				,		help="The input data dir. Should contain the .tsv files (or other data files) for the task."				,		)
					parser.add_argument(
					    "--model_name_or_path"				,		default=__A				,		type=__A				,		required=__A				,		help="Path to pretrained model or model identifier from huggingface.co/models"				,		)
					parser.add_argument(
					    "--task_name"				,		default=__A				,		type=__A				,		required=__A				,		help="The name of the task to train selected in the list: " + ", ".join(glue_processors.keys())				,		)
					parser.add_argument(
					    "--output_dir"				,		default=__A				,		type=__A				,		required=__A				,		help="The output directory where the model predictions and checkpoints will be written."				,		)

					# Other parameters
					parser.add_argument(
					    "--config_name"				,		default=""				,		type=__A				,		help="Pretrained config name or path if not the same as model_name_or_path"				,		)
					parser.add_argument(
					    "--tokenizer_name"				,		default=""				,		type=__A				,		help="Pretrained tokenizer name or path if not the same as model_name_or_path"				,		)
					parser.add_argument(
					    "--cache_dir"				,		default=__A				,		type=__A				,		help="Where do you want to store the pre-trained models downloaded from huggingface.co"				,		)
					parser.add_argument(
					    "--data_subset"				,		type=__A				,		default=-1				,		help="If > 0: limit the data to a subset of data_subset instances.")
					parser.add_argument(
					    "--overwrite_output_dir"				,		action="store_true"				,		help="Whether to overwrite data in output directory")
					parser.add_argument(
					    "--overwrite_cache"				,		action="store_true"				,		help="Overwrite the cached training and evaluation sets")

					parser.add_argument(
					    "--dont_normalize_importance_by_layer"				,		action="store_true"				,		help="Don\'t normalize importance score by layers")
					parser.add_argument(
					    "--dont_normalize_global_importance"				,		action="store_true"				,		help="Don\'t normalize all importance scores between 0 and 1"				,		)

					parser.add_argument(
					    "--try_masking"				,		action="store_true"				,		help="Whether to try to mask head until a threshold of accuracy.")
					parser.add_argument(
					    "--masking_threshold"				,		default=0.9				,		type=__A				,		help="masking threshold in term of metrics (stop masking when metric < threshold * original metric value)."				,		)
					parser.add_argument(
					    "--masking_amount"				,		default=0.1				,		type=__A				,		help="Amount to heads to masking at each masking step.")
					parser.add_argument("--metric_name"				,		default="acc"				,		type=__A				,		help="Metric to use for head masking.")

					parser.add_argument(
					    "--max_seq_length"				,		default=1_28				,		type=__A				,		help=(
					        "The maximum total input sequence length after WordPiece tokenization. \n"
					        "Sequences longer than this will be truncated, sequences shorter padded."
					    )				,		)
					parser.add_argument("--batch_size"				,		default=1				,		type=__A				,		help="Batch size.")

					parser.add_argument("--seed"				,		type=__A				,		default=42)
					parser.add_argument("--local_rank"				,		type=__A				,		default=-1				,		help="local_rank for distributed training on gpus")
					parser.add_argument("--no_cuda"				,		action="store_true"				,		help="Whether not to use CUDA when available")
					parser.add_argument("--server_ip"				,		type=__A				,		default=""				,		help="Can be used for distant debugging.")
					parser.add_argument("--server_port"				,		type=__A				,		default=""				,		help="Can be used for distant debugging.")
					UpperCamelCase_											=				parser.parse_args()

					if args.server_ip and args.server_port:
										# Distant debugging - see https://code.visualstudio.com/docs/python/debugging#_attach-to-a-local-script
										import ptvsd

										print("Waiting for debugger attach")
										ptvsd.enable_attach(address=(args.server_ip, args.server_port)				,		redirect_output=__A)
										ptvsd.wait_for_attach()

					# Setup devices and distributed training
					if args.local_rank == -1 or args.no_cuda:
										UpperCamelCase_											=				torch.device("cuda" if torch.cuda.is_available() and not args.no_cuda else "cpu")
										UpperCamelCase_											=				0 if args.no_cuda else torch.cuda.device_count()
					else:
										torch.cuda.set_device(args.local_rank)
										UpperCamelCase_											=				torch.device("cuda"				,		args.local_rank)
										UpperCamelCase_											=				1
										torch.distributed.init_process_group(backend="nccl")  # Initializes the distributed backend

					# Setup logging
					logging.basicConfig(level=logging.INFO if args.local_rank in [-1, 0] else logging.WARN)
					logger.info("device: {} n_gpu: {}, distributed: {}".format(args.device				,		args.n_gpu				,		bool(args.local_rank != -1)))
					# Set the verbosity to info of the Transformers logger (on main process only):
					if is_main_process(args.local_rank):
										transformers.utils.logging.set_verbosity_info()
										transformers.utils.logging.enable_default_handler()
										transformers.utils.logging.enable_explicit_format()

					# Set seeds
					set_seed(args.seed)

					# Prepare GLUE task
					UpperCamelCase_											=				args.task_name.lower()
					if args.task_name not in glue_processors:
										raise ValueError("Task not found: %s" % (args.task_name))
					UpperCamelCase_											=				glue_processors[args.task_name]()
					UpperCamelCase_											=				glue_output_modes[args.task_name]
					UpperCamelCase_											=				processor.get_labels()
					UpperCamelCase_											=				len(__A)

					# Load pretrained model and tokenizer
					#
					# Distributed training:
					# The .from_pretrained methods guarantee that only one local process can concurrently
					# download model & vocab.

					UpperCamelCase_											=				AutoConfig.from_pretrained(
					    args.config_name if args.config_name else args.model_name_or_path				,		num_labels=__A				,		finetuning_task=args.task_name				,		output_attentions=__A				,		cache_dir=args.cache_dir				,		)
					UpperCamelCase_											=				AutoTokenizer.from_pretrained(
					    args.tokenizer_name if args.tokenizer_name else args.model_name_or_path				,		cache_dir=args.cache_dir				,		)
					UpperCamelCase_											=				AutoModelForSequenceClassification.from_pretrained(
					    args.model_name_or_path				,		from_tf=bool(".ckpt" in args.model_name_or_path)				,		config=__A				,		cache_dir=args.cache_dir				,		)

					# Distributed and parallel training
					model.to(args.device)
					if args.local_rank != -1:
										UpperCamelCase_											=				nn.parallel.DistributedDataParallel(
										    __A				,		device_ids=[args.local_rank]				,		output_device=args.local_rank				,		find_unused_parameters=__A)
					elif args.n_gpu > 1:
										UpperCamelCase_											=				nn.DataParallel(__A)

					# Print/save training arguments
					os.makedirs(args.output_dir				,		exist_ok=__A)
					torch.save(__A				,		os.path.join(args.output_dir				,		"run_args.bin"))
					logger.info("Training/evaluation parameters %s"				,		__A)

					# Prepare dataset for the GLUE task
					UpperCamelCase_											=				GlueDataset(__A				,		tokenizer=__A				,		mode="dev")
					if args.data_subset > 0:
										UpperCamelCase_											=				Subset(__A				,		list(range(min(args.data_subset				,		len(__A)))))
					UpperCamelCase_											=				SequentialSampler(__A) if args.local_rank == -1 else DistributedSampler(__A)
					UpperCamelCase_											=				DataLoader(
					    __A				,		sampler=__A				,		batch_size=args.batch_size				,		collate_fn=__A)

					# Compute head entropy and importance score
					compute_heads_importance(__A				,		__A				,		__A)

					# Try head masking (set heads to zero until the score goes under a threshole)
					# and head pruning (remove masked heads and see the effect on the network)
					if args.try_masking and args.masking_threshold > 0.0 and args.masking_threshold < 1.0:
										UpperCamelCase_											=				mask_heads(__A				,		__A				,		__A)
										prune_heads(__A				,		__A				,		__A				,		__A)


if __name__ == "__main__":
	main()







from __future__ import annotations



def 				_lowerCAmelCase      (_lowerCAmelCase):
					UpperCamelCase_											=				{1}
					UpperCamelCase_											=				[1]
					for _ in range(2				,		depth + 1):
										UpperCamelCase_											=				[*previous_coefficients, 0]
										UpperCamelCase_											=				[0, *previous_coefficients]
										UpperCamelCase_											=				[]
										for x, y in zip(_lowerCAmelCase				,		_lowerCAmelCase):
															coefficients.add(x + y)
															previous_coefficients.append(x + y)
					return coefficients



def 				_lowerCAmelCase      (_lowerCAmelCase):
					UpperCamelCase_											=				set()
					for number in unique_coefficients:
										UpperCamelCase_											=				2
										UpperCamelCase_											=				number
										while divisor**2 <= copy_number:
															UpperCamelCase_											=				0
															while copy_number % divisor == 0:
																				copy_number //= divisor
																				multiplicity += 1
															if multiplicity >= 2:
																				non_squarefrees.add(_lowerCAmelCase)
																				break
															divisor += 1

					return unique_coefficients.difference(_lowerCAmelCase)



def 				_lowerCAmelCase      (_lowerCAmelCase = 51):
					UpperCamelCase_											=				get_pascal_triangle_unique_coefficients(_lowerCAmelCase)
					UpperCamelCase_											=				get_squarefrees(_lowerCAmelCase)
					return sum(_lowerCAmelCase)


if __name__ == "__main__":
	print(F"{solution() = }")
