pca
===============================================================================

.. py:module:: evalml.pipelines.components.transformers.dimensionality_reduction.pca

.. autoapi-nested-parse::

   Component that reduces the number of features by using Principal Component Analysis (PCA).



Module Contents
---------------

Classes Summary
~~~~~~~~~~~~~~~

.. autoapisummary::

   evalml.pipelines.components.transformers.dimensionality_reduction.pca.PCA





Contents
~~~~~~~~~~~~~~~~~~~
.. py:class:: PCA(variance=0.95, n_components=None, random_seed=0, **kwargs)



   Reduces the number of features by using Principal Component Analysis (PCA).

   :param variance: The percentage of the original data variance that should be preserved when reducing the
                    number of features. Defaults to 0.95.
   :type variance: float
   :param n_components: The number of features to maintain after computing SVD. Defaults to None, but will override
                        variance variable if set.
   :type n_components: int
   :param random_seed: Seed for the random number generator. Defaults to 0.
   :type random_seed: int


   **Attributes**

   .. list-table::
      :widths: 15 85
      :header-rows: 0

      * - **hyperparameter_ranges**
        - Real(0.25, 1)}:type: {"variance"
      * - **modifies_features**
        - True
      * - **modifies_target**
        - False
      * - **name**
        - PCA Transformer
      * - **training_only**
        - False


   **Methods**

   .. autoapisummary::
      :nosignatures:

      evalml.pipelines.components.transformers.dimensionality_reduction.pca.PCA.clone
      evalml.pipelines.components.transformers.dimensionality_reduction.pca.PCA.default_parameters
      evalml.pipelines.components.transformers.dimensionality_reduction.pca.PCA.describe
      evalml.pipelines.components.transformers.dimensionality_reduction.pca.PCA.fit
      evalml.pipelines.components.transformers.dimensionality_reduction.pca.PCA.fit_transform
      evalml.pipelines.components.transformers.dimensionality_reduction.pca.PCA.load
      evalml.pipelines.components.transformers.dimensionality_reduction.pca.PCA.needs_fitting
      evalml.pipelines.components.transformers.dimensionality_reduction.pca.PCA.parameters
      evalml.pipelines.components.transformers.dimensionality_reduction.pca.PCA.save
      evalml.pipelines.components.transformers.dimensionality_reduction.pca.PCA.transform
      evalml.pipelines.components.transformers.dimensionality_reduction.pca.PCA.update_parameters

   .. py:method:: clone(self)

      Constructs a new component with the same parameters and random state.

      :returns: A new instance of this component with identical parameters and random state.


   .. py:method:: default_parameters(cls)

      Returns the default parameters for this component.

      Our convention is that Component.default_parameters == Component().parameters.

      :returns: Default parameters for this component.
      :rtype: dict


   .. py:method:: describe(self, print_name=False, return_dict=False)

      Describe a component and its parameters.

      :param print_name: whether to print name of component
      :type print_name: bool, optional
      :param return_dict: whether to return description as dictionary in the format {"name": name, "parameters": parameters}
      :type return_dict: bool, optional

      :returns: Returns dictionary if return_dict is True, else None.
      :rtype: None or dict


   .. py:method:: fit(self, X, y=None)

      Fits the PCA component.

      :param X: The input training data of shape [n_samples, n_features].
      :type X: pd.DataFrame
      :param y: The target training data of length [n_samples].
      :type y: pd.Series, optional

      :returns: self

      :raises ValueError: If input data is not all numeric.


   .. py:method:: fit_transform(self, X, y=None)

      Fit and transform data using the PCA component.

      :param X: The input training data of shape [n_samples, n_features].
      :type X: pd.DataFrame
      :param y: The target training data of length [n_samples].
      :type y: pd.Series, optional

      :returns: Transformed data.
      :rtype: pd.DataFrame

      :raises ValueError: If input data is not all numeric.


   .. py:method:: load(file_path)
      :staticmethod:

      Loads component at file path.

      :param file_path: Location to load file.
      :type file_path: str

      :returns: ComponentBase object


   .. py:method:: needs_fitting(self)

      Returns boolean determining if component needs fitting before calling predict, predict_proba, transform, or feature_importances.

      This can be overridden to False for components that do not need to be fit or whose fit methods do nothing.

      :returns: True.


   .. py:method:: parameters(self)
      :property:

      Returns the parameters which were used to initialize the component.


   .. py:method:: save(self, file_path, pickle_protocol=cloudpickle.DEFAULT_PROTOCOL)

      Saves component at file path.

      :param file_path: Location to save file.
      :type file_path: str
      :param pickle_protocol: The pickle data stream format.
      :type pickle_protocol: int


   .. py:method:: transform(self, X, y=None)

      Transform data using fitted PCA component.

      :param X: The input training data of shape [n_samples, n_features].
      :type X: pd.DataFrame
      :param y: The target training data of length [n_samples].
      :type y: pd.Series, optional

      :returns: Transformed data.
      :rtype: pd.DataFrame

      :raises ValueError: If input data is not all numeric.


   .. py:method:: update_parameters(self, update_dict, reset_fit=True)

      Updates the parameter dictionary of the component.

      :param update_dict: A dict of parameters to update.
      :type update_dict: dict
      :param reset_fit: If True, will set `_is_fitted` to False.
      :type reset_fit: bool, optional