





"""simple docstring"""




from __future__ import annotations





def 		UpperCAmelCase__						(	_UpperCAmelCase   ):






  """simple docstring"""





  global graph, reversed_graph, scc, component, visit, stack
  if visit[u]:
    return
  A_    :			Optional[int]									=    True
  for v in graph[u]:
    dfs(lowerCamelCase__   )
  stack.append(lowerCamelCase__   )





def 		UpperCAmelCase__						(	_UpperCAmelCase   ):






  """simple docstring"""





  global graph, reversed_graph, scc, component, visit, stack
  if visit[u]:
    return
  A_    :			Any									=    True
  component.append(lowerCamelCase__   )
  for v in reversed_graph[u]:
    dfsa(lowerCamelCase__   )





def 		UpperCAmelCase__						(	):






  """simple docstring"""





  global graph, reversed_graph, scc, component, visit, stack
  for i in range(lowerCamelCase__   ):
    dfs(lowerCamelCase__   )
  A_    :			str									=    [False] * n
  for i in stack[::-1]:
    if visit[i]:
      continue
    A_    :			int									=    []
    dfsa(lowerCamelCase__   )
    scc.append(lowerCamelCase__   )
  return scc


if __name__ == "__main__":
   # n - no of nodes, m - no of edges
   lowerCamelCase_   ,   lowerCamelCase_	:		int         =   list(map(int, input().strip().split()))

   lowerCamelCase_	:		Optional[int]         =   [[] for _ in range(n)]  # graph
   lowerCamelCase_	:		int         =   [[] for i in range(n)]  # reversed graph
   # input graph data (edges)
   for _ in range(m):
      lowerCamelCase_   ,   lowerCamelCase_	:		Dict         =   list(map(int, input().strip().split()))
      graph[u].append(v)
      reversed_graph[v].append(u)

   lowerCamelCase_	:		Optional[Any]         =   []
   lowerCamelCase_	:		str         =   [False] * n
   lowerCamelCase_	:		str         =   []
   lowerCamelCase_	:		List[str]         =   []
   print(kosaraju())
import argparse
import ast
import logging
import os
import sys

import pandas as pd
import torch
from tqdm import tqdm

from transformers import BartForConditionalGeneration, RagRetriever, RagSequenceForGeneration, RagTokenForGeneration
from transformers import logging as transformers_logging


sys.path.append(os.path.join(os.getcwd()))  # noqa: E402 # isort:skip
from utils_rag import exact_match_score, fa_score  # noqa: E402 # isort:skip


_SCREAMING_SNAKE_CASE     =     logging.getLogger(__name__)
logging.basicConfig(level=logging.INFO)

transformers_logging.set_verbosity_info()
def 					__lowercase						(    lowerCamelCase__       )					->Any:

  '''simple docstring'''




  if "token" in model_name_or_path:
    return "rag_token"
  if "sequence" in model_name_or_path:
    return "rag_sequence"
  if "bart" in model_name_or_path:
    return "bart"
  return None
def 					__lowercase						(    lowerCamelCase__			,					lowerCamelCase__			,					lowerCamelCase__       )					->List[str]:

  '''simple docstring'''




  return max(metric_fn(lowerCamelCase__			,					lowerCamelCase__       ) for gt in ground_truths       )
def 					__lowercase						(    lowerCamelCase__			,					lowerCamelCase__			,					lowerCamelCase__       )					->Optional[Any]:

  '''simple docstring'''




  a__  		=  [line.strip() for line in open(lowerCamelCase__			,					"r"       ).readlines()]
  a__  		=  []

  if args.gold_data_mode == "qa":
    a__  		=  pd.read_csv(lowerCamelCase__			,					sep="\t"			,					header=lowerCamelCase__       )
    for answer_list in data[1]:
      a__  		=  ast.literal_eval(lowerCamelCase__       )
      answers.append(lowerCamelCase__       )
  else:
    a__  		=  [line.strip() for line in open(lowerCamelCase__			,					"r"       ).readlines()]
    a__  		=  [[reference] for reference in references]

  a__  		=  a__  		=  a__  		=  0
  for prediction, ground_truths in zip(lowerCamelCase__			,					lowerCamelCase__       ):
    total += 1
    em += metric_max_over_ground_truths(lowerCamelCase__			,					lowerCamelCase__			,					lowerCamelCase__       )
    fa += metric_max_over_ground_truths(lowerCamelCase__			,					lowerCamelCase__			,					lowerCamelCase__       )

  a__  		=  100.0 * em / total
  a__  		=  100.0 * fa / total

  logger.info(f"F1: {fa:.2f}"       )
  logger.info(f"EM: {em:.2f}"       )
def 					__lowercase						(    lowerCamelCase__			,					lowerCamelCase__			,					lowerCamelCase__       )					->Tuple:

  '''simple docstring'''




  a__  		=  args.k
  a__  		=  [line.strip() for line in open(lowerCamelCase__			,					"r"       ).readlines()]
  a__  		=  [line.strip() for line in open(lowerCamelCase__			,					"r"       ).readlines()]

  a__  		=  a__  		=  0
  for hypo, reference in zip(lowerCamelCase__			,					lowerCamelCase__       ):
    a__  		=  set(hypo.split("\t"       )[:k]       )
    a__  		=  set(reference.split("\t"       )       )
    total += 1
    em += len(hypo_provenance & ref_provenance       ) / k

  a__  		=  100.0 * em / total
  logger.info(f"Precision@{k}: {em: .2f}"       )
def 					__lowercase						(    lowerCamelCase__			,					lowerCamelCase__			,					lowerCamelCase__       )					->str:

  '''simple docstring'''




  def strip_title(lowerCamelCase__       ):
    if title.startswith("\""       ):
      a__  		=  title[1:]
    if title.endswith("\""       ):
      a__  		=  title[:-1]
    return title

  a__  		=  rag_model.retriever.question_encoder_tokenizer.batch_encode_plus(
      lowerCamelCase__			,					return_tensors="pt"			,					padding=lowerCamelCase__			,					truncation=lowerCamelCase__			,					)["input_ids"].to(args.device       )

  a__  		=  rag_model.rag.question_encoder(lowerCamelCase__       )
  a__  		=  question_enc_outputs[0]

  a__  		=  rag_model.retriever(
      lowerCamelCase__			,					question_enc_pool_output.cpu().detach().to(torch.floataa       ).numpy()			,					prefix=rag_model.rag.generator.config.prefix			,					n_docs=rag_model.config.n_docs			,					return_tensors="pt"			,					)
  a__  		=  rag_model.retriever.index.get_doc_dicts(result.doc_ids       )
  a__  		=  []
  for docs in all_docs:
    a__  		=  [strip_title(lowerCamelCase__       ) for title in docs["title"]]
    provenance_strings.append("\t".join(lowerCamelCase__       )       )
  return provenance_strings
def 					__lowercase						(    lowerCamelCase__			,					lowerCamelCase__			,					lowerCamelCase__       )					->List[str]:

  '''simple docstring'''




  with torch.no_grad():
    a__  		=  rag_model.retriever.question_encoder_tokenizer.batch_encode_plus(
        lowerCamelCase__			,					return_tensors="pt"			,					padding=lowerCamelCase__			,					truncation=lowerCamelCase__       )

    a__  		=  inputs_dict.input_ids.to(args.device       )
    a__  		=  inputs_dict.attention_mask.to(args.device       )
    a__  		=  rag_model.generate(  # rag_model overwrites generate
        lowerCamelCase__			,					attention_mask=lowerCamelCase__			,					num_beams=args.num_beams			,					min_length=args.min_length			,					max_length=args.max_length			,					early_stopping=lowerCamelCase__			,					num_return_sequences=1			,					bad_words_ids=[[0, 0]]			,					)
    a__  		=  rag_model.retriever.generator_tokenizer.batch_decode(lowerCamelCase__			,					skip_special_tokens=lowerCamelCase__       )

    if args.print_predictions:
      for q, a in zip(lowerCamelCase__			,					lowerCamelCase__       ):
        logger.info("Q: {} - A: {}".format(lowerCamelCase__			,					lowerCamelCase__       )       )

    return answers
def 					__lowercase						(    )					->str:

  '''simple docstring'''




  a__  		=  argparse.ArgumentParser()
  parser.add_argument(
      "--model_type"			,					choices=["rag_sequence", "rag_token", "bart"]			,					type=lowerCamelCase__			,					help=(
          "RAG model type: rag_sequence, rag_token or bart, if none specified, the type is inferred from the"
          " model_name_or_path"
      )			,					)
  parser.add_argument(
      "--index_name"			,					default=lowerCamelCase__			,					choices=["exact", "compressed", "legacy"]			,					type=lowerCamelCase__			,					help="RAG model retriever type"			,					)
  parser.add_argument(
      "--index_path"			,					default=lowerCamelCase__			,					type=lowerCamelCase__			,					help="Path to the retrieval index"			,					)
  parser.add_argument("--n_docs"			,					default=5			,					type=lowerCamelCase__			,					help="Number of retrieved docs"       )
  parser.add_argument(
      "--model_name_or_path"			,					default=lowerCamelCase__			,					type=lowerCamelCase__			,					required=lowerCamelCase__			,					help="Path to pretrained checkpoints or model identifier from huggingface.co/models"			,					)
  parser.add_argument(
      "--eval_mode"			,					choices=["e2e", "retrieval"]			,					default="e2e"			,					type=lowerCamelCase__			,					help=(
          "Evaluation mode, e2e calculates exact match and F1 of the downstream task, retrieval calculates"
          " precision@k."
      )			,					)
  parser.add_argument("--k"			,					default=1			,					type=lowerCamelCase__			,					help="k for the precision@k calculation"       )
  parser.add_argument(
      "--evaluation_set"			,					default=lowerCamelCase__			,					type=lowerCamelCase__			,					required=lowerCamelCase__			,					help="Path to a file containing evaluation samples"			,					)
  parser.add_argument(
      "--gold_data_path"			,					default=lowerCamelCase__			,					type=lowerCamelCase__			,					required=lowerCamelCase__			,					help="Path to a tab-separated file with gold samples"			,					)
  parser.add_argument(
      "--gold_data_mode"			,					default="qa"			,					type=lowerCamelCase__			,					choices=["qa", "ans"]			,					help=(
          "Format of the gold data file"
          "qa - a single line in the following format: question [tab] answer_list"
          "ans - a single line of the gold file contains the expected answer string"
      )			,					)
  parser.add_argument(
      "--predictions_path"			,					type=lowerCamelCase__			,					default="predictions.txt"			,					help="Name of the predictions file, to be stored in the checkpoints directory"			,					)
  parser.add_argument(
      "--eval_all_checkpoints"			,					action="store_true"			,					help="Evaluate all checkpoints starting with the same prefix as model_name ending and ending with step number"			,					)
  parser.add_argument(
      "--eval_batch_size"			,					default=8			,					type=lowerCamelCase__			,					help="Batch size per GPU/CPU for evaluation."			,					)
  parser.add_argument(
      "--recalculate"			,					help="Recalculate predictions even if the prediction file exists"			,					action="store_true"			,					)
  parser.add_argument(
      "--num_beams"			,					default=4			,					type=lowerCamelCase__			,					help="Number of beams to be used when generating answers"			,					)
  parser.add_argument("--min_length"			,					default=1			,					type=lowerCamelCase__			,					help="Min length of the generated answers"       )
  parser.add_argument("--max_length"			,					default=50			,					type=lowerCamelCase__			,					help="Max length of the generated answers"       )

  parser.add_argument(
      "--print_predictions"			,					action="store_true"			,					help="If True, prints predictions while evaluating."			,					)
  parser.add_argument(
      "--print_docs"			,					action="store_true"			,					help="If True, prints docs retried while generating."			,					)
  a__  		=  parser.parse_args()
  a__  		=  torch.device("cuda" if torch.cuda.is_available() else "cpu"       )
  return args
def 					__lowercase						(    lowerCamelCase__       )					->Dict:

  '''simple docstring'''




  a__  		=  {}
  if args.model_type is None:
    a__  		=  infer_model_type(args.model_name_or_path       )
    assert args.model_type is not None
  if args.model_type.startswith("rag"       ):
    a__  		=  RagTokenForGeneration if args.model_type == "rag_token" else RagSequenceForGeneration
    a__  		=  args.n_docs
    if args.index_name is not None:
      a__  		=  args.index_name
    if args.index_path is not None:
      a__  		=  args.index_path
  else:
    a__  		=  BartForConditionalGeneration

  a__  		=  (
      [f.path for f in os.scandir(args.model_name_or_path       ) if f.is_dir()]
      if args.eval_all_checkpoints
      else [args.model_name_or_path]
  )

  logger.info("Evaluate the following checkpoints: %s"			,					lowerCamelCase__       )

  a__  		=  get_scores if args.eval_mode == "e2e" else get_precision_at_k
  a__  		=  evaluate_batch_eae if args.eval_mode == "e2e" else evaluate_batch_retrieval

  for checkpoint in checkpoints:
    if os.path.exists(args.predictions_path       ) and (not args.recalculate):
      logger.info("Calculating metrics based on an existing predictions file: {}".format(args.predictions_path       )       )
      score_fn(lowerCamelCase__			,					args.predictions_path			,					args.gold_data_path       )
      continue

    logger.info("***** Running evaluation for {} *****".format(lowerCamelCase__       )       )
    logger.info("  Batch size = %d"			,					args.eval_batch_size       )
    logger.info("  Predictions will be stored under {}".format(args.predictions_path       )       )

    if args.model_type.startswith("rag"       ):
      a__  		=  RagRetriever.from_pretrained(lowerCamelCase__			,					**lowerCamelCase__       )
      a__  		=  model_class.from_pretrained(lowerCamelCase__			,					retriever=lowerCamelCase__			,					**lowerCamelCase__       )
      model.retriever.init_retrieval()
    else:
      a__  		=  model_class.from_pretrained(lowerCamelCase__			,					**lowerCamelCase__       )
    model.to(args.device       )

    with open(args.evaluation_set			,					"r"       ) as eval_file, open(args.predictions_path			,					"w"       ) as preds_file:
      a__  		=  []
      for line in tqdm(lowerCamelCase__       ):
        questions.append(line.strip()       )
        if len(lowerCamelCase__       ) == args.eval_batch_size:
          a__  		=  evaluate_batch_fn(lowerCamelCase__			,					lowerCamelCase__			,					lowerCamelCase__       )
          preds_file.write("\n".join(lowerCamelCase__       ) + "\n"       )
          preds_file.flush()
          a__  		=  []
      if len(lowerCamelCase__       ) > 0:
        a__  		=  evaluate_batch_fn(lowerCamelCase__			,					lowerCamelCase__			,					lowerCamelCase__       )
        preds_file.write("\n".join(lowerCamelCase__       )       )
        preds_file.flush()

      score_fn(lowerCamelCase__			,					args.predictions_path			,					args.gold_data_path       )


if __name__ == "__main__":
     _SCREAMING_SNAKE_CASE     =     get_args()
     main(args)

