matchzoo.preprocessors.basic_preprocessor

Basic Preprocessor.

Module Contents

class matchzoo.preprocessors.basic_preprocessor.BasicPreprocessor(truncated_mode:str='pre', truncated_length_left:int=30, truncated_length_right:int=30, filter_mode:str='df', filter_low_freq:float=1, filter_high_freq:float=float('inf'), remove_stop_words:bool=False)

Bases: matchzoo.engine.base_preprocessor.BasePreprocessor

Baisc preprocessor helper.

Parameters:
  • truncated_mode – String, mode used by TruncatedLength. Can be ‘pre’ or ‘post’.
  • truncated_length_left – Integer, maximize length of left in the data_pack.
  • truncated_length_right – Integer, maximize length of right in the data_pack.
  • filter_mode – String, mode used by FrequenceFilterUnit. Can be ‘df’, ‘cf’, and ‘idf’.
  • filter_low_freq – Float, lower bound value used by FrequenceFilterUnit.
  • filter_high_freq – Float, upper bound value used by FrequenceFilterUnit.
  • remove_stop_words – Bool, use StopRemovalUnit unit or not.

Example

>>> import matchzoo as mz
>>> train_data = mz.datasets.toy.load_data('train')
>>> test_data = mz.datasets.toy.load_data('test')
>>> preprocessor = mz.preprocessors.BasicPreprocessor(
...     truncated_length_left=10,
...     truncated_length_right=20,
...     filter_mode='df',
...     filter_low_freq=2,
...     filter_high_freq=1000,
...     remove_stop_words=True
... )
>>> preprocessor = preprocessor.fit(train_data, verbose=0)
>>> preprocessor.context['vocab_size']
226
>>> processed_train_data = preprocessor.transform(train_data,
...                                               verbose=0)
>>> type(processed_train_data)
<class 'matchzoo.data_pack.data_pack.DataPack'>
>>> test_data_transformed = preprocessor.transform(test_data,
...                                                verbose=0)
>>> type(test_data_transformed)
<class 'matchzoo.data_pack.data_pack.DataPack'>
fit(self, data_pack:DataPack, verbose:int=1)

Fit pre-processing context for transformation.

Parameters:
  • data_pack – data_pack to be preprocessed.
  • verbose – Verbosity.
Returns:

class:BasicPreprocessor instance.
transform(self, data_pack:DataPack, verbose:int=1)

Apply transformation on data, create truncated length representation.

Parameters:
  • data_pack – Inputs to be preprocessed.
  • verbose – Verbosity.
Returns:

Transformed data as DataPack object.