freqtrade_origin/freqtrade/freqai/base_models/FreqaiMultiOutputClassifier.py

93 lines
3.4 KiB
Python

import numpy as np
from sklearn.base import is_classifier
from sklearn.multioutput import MultiOutputClassifier, _fit_estimator
from sklearn.utils.multiclass import check_classification_targets
from sklearn.utils.parallel import Parallel, delayed
from sklearn.utils.validation import has_fit_parameter
from freqtrade.exceptions import OperationalException
class FreqaiMultiOutputClassifier(MultiOutputClassifier):
def fit(self, X, y, sample_weight=None, fit_params=None):
"""Fit the model to data, separately for each output variable.
Parameters
----------
X : {array-like, sparse matrix} of shape (n_samples, n_features)
The input data.
y : {array-like, sparse matrix} of shape (n_samples, n_outputs)
Multi-output targets. An indicator matrix turns on multilabel
estimation.
sample_weight : array-like of shape (n_samples,), default=None
Sample weights. If `None`, then samples are equally weighted.
Only supported if the underlying classifier supports sample
weights.
fit_params : A list of dicts for the fit_params
Parameters passed to the ``estimator.fit`` method of each step.
Each dict may contain same or different values (e.g. different
eval_sets or init_models)
.. versionadded:: 0.23
Returns
-------
self : object
Returns a fitted instance.
"""
if not hasattr(self.estimator, "fit"):
raise ValueError("The base estimator should implement a fit method")
y = self._validate_data(X="no_validation", y=y, multi_output=True)
if is_classifier(self):
check_classification_targets(y)
if y.ndim == 1:
raise ValueError(
"y must have at least two dimensions for "
"multi-output regression but has only one."
)
if sample_weight is not None and not has_fit_parameter(
self.estimator, "sample_weight"
):
raise ValueError("Underlying estimator does not support sample weights.")
if not fit_params:
fit_params = [None] * y.shape[1]
self.estimators_ = Parallel(n_jobs=self.n_jobs)(
delayed(_fit_estimator)(
self.estimator, X, y[:, i], sample_weight, **fit_params[i]
)
for i in range(y.shape[1])
)
self.classes_ = []
for estimator in self.estimators_:
self.classes_.extend(estimator.classes_)
if len(set(self.classes_)) != len(self.classes_):
raise OperationalException(f"Class labels must be unique across targets: "
f"{self.classes_}")
if hasattr(self.estimators_[0], "n_features_in_"):
self.n_features_in_ = self.estimators_[0].n_features_in_
if hasattr(self.estimators_[0], "feature_names_in_"):
self.feature_names_in_ = self.estimators_[0].feature_names_in_
return self
def predict_proba(self, X):
"""
Get predict_proba and stack arrays horizontally
"""
results = np.hstack(super().predict_proba(X))
return np.squeeze(results)
def predict(self, X):
"""
Get predict and squeeze into 2D array
"""
results = super().predict(X)
return np.squeeze(results)