




import argparse
import datetime
import json
import time
import warnings
from logging import getLogger
from pathlib import Path
from typing import Dict, List

import torch
from tqdm import tqdm

from transformers import AutoModelForSeqaSeqLM, AutoTokenizer
from utils import calculate_bleu, calculate_rouge, chunks, parse_numeric_n_bool_cl_kwargs, use_task_specific_params


UpperCAmelCase__    :							List[Any]       		=     getLogger(__name__)


UpperCAmelCase__    :							Optional[int]       		=     'cuda' if torch.cuda.is_available() else 'cpu'


def 		_lowerCamelCase					(       UpperCamelCase       ,  UpperCamelCase       ,  UpperCamelCase       ,  UpperCamelCase = 8       ,  UpperCamelCase = DEFAULT_DEVICE       ,  UpperCamelCase=False       ,  UpperCamelCase="summarization"       ,  UpperCamelCase=None       ,  **UpperCamelCase       ,  )      ->		Dict:





  """simple docstring"""





  _lowercase:			List[str]      =     Path(UpperCamelCase				).open('w'       ,  encoding='utf-8'				)
  _lowercase:			str      =     str(UpperCamelCase				)
  _lowercase:			Optional[int]      =     AutoModelForSeqaSeqLM.from_pretrained(UpperCamelCase				).to(UpperCamelCase				)
  if fpaa:
    _lowercase:			Tuple      =     model.half()

  _lowercase:			List[Any]      =     AutoTokenizer.from_pretrained(UpperCamelCase				)
  logger.info(F'Inferred tokenizer type: {tokenizer.__class__}'				)  # if this is wrong, check config.model_type.

  _lowercase:			Union[str, Any]      =     time.time()
  # update config with task specific params
  use_task_specific_params(UpperCamelCase       ,  UpperCamelCase				)
  if prefix is None:
    _lowercase:			int      =     prefix or getattr(model.config       ,  'prefix'       ,  ''				) or ''
  for examples_chunk in tqdm(list(chunks(UpperCamelCase       ,  UpperCamelCase				)				)				):
    _lowercase:			Dict      =     [prefix + text for text in examples_chunk]
    _lowercase:			Dict      =     tokenizer(UpperCamelCase       ,  return_tensors='pt'       ,  truncation=UpperCamelCase       ,  padding='longest'				).to(UpperCamelCase				)
    _lowercase:			Any      =     model.generate(
        input_ids=batch.input_ids       ,  attention_mask=batch.attention_mask       ,  **UpperCamelCase       ,  )
    _lowercase:			List[Any]      =     tokenizer.batch_decode(UpperCamelCase       ,  skip_special_tokens=UpperCamelCase       ,  clean_up_tokenization_spaces=UpperCamelCase				)
    for hypothesis in dec:
      fout.write(hypothesis + '\n'				)
      fout.flush()
  fout.close()
  _lowercase:			List[Any]      =     int(time.time() - start_time				)  # seconds
  _lowercase:			int      =     len(UpperCamelCase				)
  return {"n_obs": n_obs, "runtime": runtime, "seconds_per_sample": round(runtime / n_obs       ,  4				)}


def 		_lowerCamelCase					(       )      ->		List[Any]:





  """simple docstring"""





  return datetime.datetime.now().strftime('%Y-%m-%d %H:%M:%S'				)


def 		_lowerCamelCase					(       UpperCamelCase=True				)      ->		Any:





  """simple docstring"""





  _lowercase:			str      =     argparse.ArgumentParser()
  parser.add_argument('model_name'       ,  type=UpperCamelCase       ,  help='like facebook/bart-large-cnn,t5-base, etc.'				)
  parser.add_argument('input_path'       ,  type=UpperCamelCase       ,  help='like cnn_dm/test.source'				)
  parser.add_argument('save_path'       ,  type=UpperCamelCase       ,  help='where to save summaries'				)
  parser.add_argument('--reference_path'       ,  type=UpperCamelCase       ,  required=UpperCamelCase       ,  help='like cnn_dm/test.target'				)
  parser.add_argument('--score_path'       ,  type=UpperCamelCase       ,  required=UpperCamelCase       ,  default='metrics.json'       ,  help='where to save metrics'				)
  parser.add_argument('--device'       ,  type=UpperCamelCase       ,  required=UpperCamelCase       ,  default=UpperCamelCase       ,  help='cuda, cuda:1, cpu etc.'				)
  parser.add_argument(
      '--prefix'       ,  type=UpperCamelCase       ,  required=UpperCamelCase       ,  default=UpperCamelCase       ,  help='will be added to the begininng of src examples'				)
  parser.add_argument('--task'       ,  type=UpperCamelCase       ,  default='summarization'       ,  help='used for task_specific_params + metrics'				)
  parser.add_argument('--bs'       ,  type=UpperCamelCase       ,  default=8       ,  required=UpperCamelCase       ,  help='batch size'				)
  parser.add_argument(
      '--n_obs'       ,  type=UpperCamelCase       ,  default=-1       ,  required=UpperCamelCase       ,  help='How many observations. Defaults to all.'				)
  parser.add_argument('--fp16'       ,  action='store_true'				)
  parser.add_argument('--dump-args'       ,  action='store_true'       ,  help='print the custom hparams with the results'				)
  parser.add_argument(
      '--info'       ,  nargs='?'       ,  type=UpperCamelCase       ,  const=datetime_now()       ,  help=(
          'use in conjunction w/ --dump-args to print with the results whatever other info you\'d like, e.g.'
          ' lang=en-ru. If no value is passed, the current datetime string will be used.'
      )       ,  )
  # Unspecified args like --num_beams=2 --decoder_start_token_id=4 are passed to model.generate
  _lowercase  ,       _lowercase:			Union[str, Any]      =     parser.parse_known_args()
  _lowercase:			str      =     parse_numeric_n_bool_cl_kwargs(UpperCamelCase				)
  if parsed_args and verbose:
    print(F'parsed the following generate kwargs: {parsed_args}'				)
  with open(args.input_path				) as f:
    _lowercase:			Optional[Any]      =     [' ' + x.rstrip() if 't5' in args.model_name else x.rstrip() for x in f.readlines()]
  if args.n_obs > 0:
    _lowercase:			Optional[Any]      =     examples[: args.n_obs]
  Path(args.save_path				).parent.mkdir(exist_ok=UpperCamelCase				)
  if args.reference_path is None and Path(args.score_path				).exists():
    warnings.warn(F'score_path {args.score_path} will be overwritten unless you type ctrl-c.'				)
  _lowercase:			Union[str, Any]      =     generate_summaries_or_translations(
      UpperCamelCase       ,  args.save_path       ,  args.model_name       ,  batch_size=args.bs       ,  device=args.device       ,  fpaa=args.fpaa       ,  task=args.task       ,  prefix=args.prefix       ,  **UpperCamelCase       ,  )

  if args.reference_path is None:
    return {}

  # Compute scores
  _lowercase:			Dict      =     calculate_bleu if 'translation' in args.task else calculate_rouge
  _lowercase:			List[str]      =     [x.rstrip() for x in open(args.save_path				).readlines()]
  _lowercase:			Optional[int]      =     [x.rstrip() for x in open(args.reference_path				).readlines()][: len(UpperCamelCase				)]
  _lowercase:			dict      =     score_fn(UpperCamelCase       ,  UpperCamelCase				)
  scores.update(UpperCamelCase				)

  if args.dump_args:
    scores.update(UpperCamelCase				)
  if args.info:
    _lowercase:			Dict      =     args.info

  if verbose:
    print(UpperCamelCase				)

  if args.score_path is not None:
    json.dump(UpperCamelCase       ,  open(args.score_path       ,  'w'				)				)

  return scores


if __name__ == "__main__":
   # Usage for MT:
   # python run_eval.py MODEL_NAME $DATA_DIR/test.source $save_dir/test_translations.txt --reference_path $DATA_DIR/test.target --score_path $save_dir/test_bleu.json  --task translation $@
   run_generate(verbose=True)






from __future__ import annotations

class   UpperCAmelCase    :






   def __init__(						self :							List[Any]    ,       UpperCamelCase_ :							int  )->      None:
     _lowercase:			Optional[Any]      =     data
     _lowercase:			Optional[int]      =     None

class   UpperCAmelCase    :






   def __init__(						self :							Optional[Any]  )->      Union[str, Any]:
     _lowercase:			List[str]      =     None






   def 			_a    (						self :							List[Any]    ,       UpperCamelCase_ :							int  )->      int:
     _lowercase:			Any      =     Node(UpperCamelCase_  )
     _lowercase:			List[Any]      =     self.head
     _lowercase:			List[str]      =     new_node
     return self.head.data






   def 			_a    (						self :							Tuple  )->      int | None:
     _lowercase:			List[str]      =     self.head
     _lowercase:			str      =     self.head
     if self.head:
       while fast_pointer and fast_pointer.next:
         _lowercase:			Optional[int]      =     fast_pointer.next.next
         _lowercase:			Tuple      =     slow_pointer.next
       return slow_pointer.data
     else:
       print('No element found.'  )
       return None


if __name__ == "__main__":
   UpperCAmelCase__    :							Union[str, Any]       		=     LinkedList()
   for _ in range(int(input().strip())):
      UpperCAmelCase__    :							List[Any]       		=     int(input().strip())
      link.push(data)
   print(link.middle_element())
