from sklearn.naive_bayes import MultinomialNB as SKLModel
import lale.helpers
import lale.operators
from numpy import nan, inf
[docs]class MultinomialNBImpl():
def __init__(self, alpha=1.0, fit_prior=True, class_prior=None):
self._hyperparams = {
'alpha': alpha,
'fit_prior': fit_prior,
'class_prior': class_prior}
[docs] def fit(self, X, y=None):
self._sklearn_model = SKLModel(**self._hyperparams)
if (y is not None):
self._sklearn_model.fit(X, y)
else:
self._sklearn_model.fit(X)
return self
[docs] def predict(self, X):
return self._sklearn_model.predict(X)
[docs] def predict_proba(self, X):
return self._sklearn_model.predict_proba(X)
_hyperparams_schema = {
'$schema': 'http://json-schema.org/draft-04/schema#',
'description': 'inherited docstring for MultinomialNB Naive Bayes classifier for multinomial models',
'allOf': [{
'type': 'object',
'required': ['alpha', 'fit_prior', 'class_prior'],
'relevantToOptimizer': ['alpha', 'fit_prior'],
'additionalProperties': False,
'properties': {
'alpha': {
'type': 'number',
'minimumForOptimizer': 1e-10,
'maximumForOptimizer': 1.0,
'distribution': 'loguniform',
'default': 1.0,
'description': 'Additive (Laplace/Lidstone) smoothing parameter'},
'fit_prior': {
'type': 'boolean',
'default': True,
'description': 'Whether to learn class prior probabilities or not.'},
'class_prior': {
'anyOf': [{
'type': 'array',
'items': {
'type': 'number'},
}, {
'enum': [None]}],
'default': None,
'description': 'Prior probabilities of the classes. If specified the priors are not'},
}}],
}
_input_fit_schema = {
'$schema': 'http://json-schema.org/draft-04/schema#',
'description': 'Fit Naive Bayes classifier according to X, y',
'type': 'object',
'properties': {
'X': {
'type': 'array',
'items': {
'type': 'array',
'items': {
'type': 'number'},
},
'description': 'Training vectors, where n_samples is the number of samples and'},
'y': {
'type': 'array',
'items': {
'type': 'number'},
'description': 'Target values.'},
'sample_weight': {
'anyOf': [{
'type': 'array',
'items': {
'type': 'number'},
}, {
'enum': [None]}],
'default': None,
'description': 'Weights applied to individual samples (1. for unweighted).'},
},
}
_input_predict_schema = {
'$schema': 'http://json-schema.org/draft-04/schema#',
'description': 'Perform classification on an array of test vectors X.',
'type': 'object',
'properties': {
'X': {
'type': 'array',
'items': {
'type': 'array',
'items': {
'type': 'number'},
}},
},
}
_output_predict_schema = {
'$schema': 'http://json-schema.org/draft-04/schema#',
'description': 'Predicted target values for X',
'type': 'array',
'items': {
'type': 'number'},
}
_input_predict_proba_schema = {
'$schema': 'http://json-schema.org/draft-04/schema#',
'description': 'Return probability estimates for the test vector X.',
'type': 'object',
'properties': {
'X': {
'type': 'array',
'items': {
'type': 'array',
'items': {
'type': 'number'},
}},
},
}
_output_predict_proba_schema = {
'$schema': 'http://json-schema.org/draft-04/schema#',
'description': 'Returns the probability of the samples for each class in',
'type': 'array',
'items': {
'type': 'array',
'items': {
'type': 'number'},
},
}
_combined_schemas = {
'$schema': 'http://json-schema.org/draft-04/schema#',
'description': 'Combined schema for expected data and hyperparameters.',
'type': 'object',
'tags': {
'pre': [],
'op': ['estimator'],
'post': []},
'properties': {
'hyperparams': _hyperparams_schema,
'input_fit': _input_fit_schema,
'input_predict': _input_predict_schema,
'output_predict': _output_predict_schema,
'input_predict_proba': _input_predict_proba_schema,
'output_predict_proba': _output_predict_proba_schema},
}
if (__name__ == '__main__'):
lale.helpers.validate_is_schema(_combined_schemas)
MultinomialNB = lale.operators.make_operator(MultinomialNBImpl, _combined_schemas)