






'''simple docstring'''
def 				a						( _UpperCAmelCase			)					->					Any:






					"""simple docstring"""







					a_						= set()
					# edges = list of graph's edges
					a_						= get_edges(__lowerCamelCase			)

					# While there are still elements in edges list, take an arbitrary edge
					# (from_node, to_node) and add his extremity to chosen_vertices and then
					# remove all arcs adjacent to the from_node and to_node
					while edges:
										a_						= edges.pop()
										chosen_vertices.add(__lowerCamelCase			)
										chosen_vertices.add(__lowerCamelCase			)
										for edge in edges.copy():
															if from_node in edge or to_node in edge:
																				edges.discard(__lowerCamelCase			)
					return chosen_vertices

def 				a						( _UpperCAmelCase			)					->					Optional[int]:






					"""simple docstring"""







					a_						= set()
					for from_node, to_nodes in graph.items():
										for to_node in to_nodes:
															edges.add((from_node, to_node)			)
					return edges


if __name__ == "__main__":
						import doctest

						doctest.testmod()

						# graph = {0: [1, 3], 1: [0, 3], 2: [0, 3, 4], 3: [0, 1, 2], 4: [2, 3]}
						# print(f"Matching vertex cover:\n{matching_min_vertex_cover(graph)}")





'''simple docstring'''






from math import ceil
from typing import List, Optional, Union

import numpy as np

from ...audio_utils import mel_filter_bank, spectrogram, window_function
from ...feature_extraction_sequence_utils import BatchFeature, SequenceFeatureExtractor
from ...utils import TensorType, logging


lowercase				=logging.get_logger(__name__)






class    __magic_name__				(						lowerCAmelCase							):
       UpperCAmelCase		 =["audio_values", "audio_mask"]






       def __init__(     self    ,				snake_case=2_0_4_8    ,				snake_case=1    ,				snake_case=[1_6, 1_6]    ,				snake_case=1_2_8    ,				snake_case=4_4_1_0_0    ,				snake_case=8_6    ,				snake_case=2_0_4_8    ,				snake_case=0.0    ,				**snake_case    ,				)		->    Optional[int]:




          '''simple docstring'''
          super().__init__(
              feature_size=snake_case    ,				sampling_rate=snake_case    ,				padding_value=snake_case    ,				**snake_case    ,				)

          _UpperCAmelCase  :  Dict				       =spectrogram_length
          _UpperCAmelCase  :  Any				       =num_channels
          _UpperCAmelCase  :  Optional[int]				       =patch_size
          _UpperCAmelCase  :  List[str]				       =feature_size // self.patch_size[1]
          _UpperCAmelCase  :  Optional[int]				       =n_fft
          _UpperCAmelCase  :  int				       =sampling_rate // hop_length_to_sampling_rate
          _UpperCAmelCase  :  int				       =sampling_rate
          _UpperCAmelCase  :  List[Any]				       =padding_value
          _UpperCAmelCase  :  Optional[int]				       =mel_filter_bank(
              num_frequency_bins=1 + n_fft // 2    ,				num_mel_filters=snake_case    ,				min_frequency=0.0    ,				max_frequency=2_20_50.0    ,				sampling_rate=snake_case    ,				norm='slaney'    ,				mel_scale='slaney'    ,				).T






       def      lowerCAmelCase						(     self    ,				snake_case)		->    np.ndarray:




          '''simple docstring'''
          _UpperCAmelCase  :  Any				       =spectrogram(
              snake_case    ,				window_function(self.n_fft    ,				'hann')    ,				frame_length=self.n_fft    ,				hop_length=self.hop_length    ,				power=2.0    ,				mel_filters=self.mel_filters.T    ,				log_mel='dB'    ,				db_range=80.0    ,				)
          _UpperCAmelCase  :  Any				       =log_spec[:, :-1]
          _UpperCAmelCase  :  List[str]				       =log_spec - 20.0
          _UpperCAmelCase  :  Union[str, Any]				       =np.clip(log_spec / 40.0    ,				-2.0    ,				0.0) + 1.0
          return log_spec






       def __call__(     self    ,				snake_case    ,				snake_case = None    ,				snake_case = True    ,				snake_case = None    ,				snake_case = False    ,				snake_case = False    ,				**snake_case    ,				)		->    BatchFeature:




          '''simple docstring'''

          if sampling_rate is not None:
             if sampling_rate != self.sampling_rate:
                raise ValueError(
                    'This feature extractor is set to support sampling rate'
                    f" of {self.sampling_rate}. Please make sure that the provided `raw_speech` input was sampled"
                    f" with {self.sampling_rate} and not {sampling_rate}.")
          else:
             logger.warning(
                 'It is strongly recommended to pass the `sampling_rate` argument to this function. '
                 'Failing to do so can result in silent errors that might be hard to debug.')

          _UpperCAmelCase  :  Tuple				       =isinstance(snake_case    ,				np.ndarray) and len(raw_speech.shape) > 1
          if is_batched_numpy and len(raw_speech.shape) > 2:
             raise ValueError(f"Only mono-channel audio is supported for input to {self}")
          _UpperCAmelCase  :  str				       =is_batched_numpy or (
              isinstance(snake_case    ,				(list, tuple)) and (isinstance(raw_speech[0]    ,				(np.ndarray, tuple, list)))
          )
          if is_batched:
             _UpperCAmelCase  :  List[str]				       =[np.asarray([speech]    ,				dtype=np.floataa).T for speech in raw_speech]
          elif not is_batched and not isinstance(snake_case    ,				np.ndarray):
             _UpperCAmelCase  :  List[Any]				       =np.asarray(snake_case    ,				dtype=np.floataa)
          elif isinstance(snake_case    ,				np.ndarray) and raw_speech.dtype is np.dtype(np.floataa):
             _UpperCAmelCase  :  List[Any]				       =raw_speech.astype(np.floataa)
          # always return batch
          if not is_batched:
             _UpperCAmelCase  :  Dict				       =[np.asarray([raw_speech]).T]

          # Convert audio signals to log mel spectrograms, truncate by time axis
          _UpperCAmelCase  :  List[Any]				       =[
              self._np_extract_fbank_features(waveform.squeeze()).T[: self.spectrogram_length] for waveform in raw_speech
          ]
          if isinstance(audio_features[0]    ,				snake_case):
             _UpperCAmelCase  :  Dict				       =[np.asarray(snake_case    ,				dtype=np.floataa) for feature in audio_features]

          # Create audio attention mask
          _UpperCAmelCase  :  Tuple				       =max(
              [ceil(feature.shape[0] / self.patch_size[0]) * self.freq_len for feature in audio_features])  # The maximum number of audio patches in a batch
          if return_attention_mask:
             _UpperCAmelCase  :  Any				       =[
                 (ceil(feature.shape[0] / self.patch_size[0]) * self.freq_len) * [1]
                 + (max_patch_len - ceil(feature.shape[0] / self.patch_size[0]) * self.freq_len) * [0]
                 for feature in audio_features
             ]
             _UpperCAmelCase  :  int				       =np.array(snake_case).astype(np.floataa)

          # convert into correct format for padding
          _UpperCAmelCase  :  List[Any]				       =max_patch_len // self.freq_len * self.patch_size[0]  # The maximum audio size in a batch
          _UpperCAmelCase  :  List[str]				       =np.ones([len(snake_case), 1, max_time_len, self.feature_size]).astype(np.floataa)
          _UpperCAmelCase  :  Any				       =padded_audio_features * self.padding_value
          for i in range(len(snake_case)):
             _UpperCAmelCase  :  List[str]				       =audio_features[i]
             _UpperCAmelCase  :  Dict				       =feature

          # return as BatchFeature
          if return_attention_mask:
             _UpperCAmelCase  :  List[str]				       ={'audio_values': padded_audio_features, 'audio_mask': audio_mask}
          else:
             _UpperCAmelCase  :  Optional[int]				       ={'audio_values': padded_audio_features}

          _UpperCAmelCase  :  Any				       =BatchFeature(data=snake_case    ,				tensor_type=snake_case)
          return encoded_inputs

