ó ‡ˆ\c@sxddlZddlmZmZddlmZddlmZddlm Z d„Z deefd „ƒYZ dS( iÿÿÿÿNi(t BaseEstimatortTransformerMixin(t check_array(tassert_allclose_dense_sparse(t string_typescCs|S(sThe identity function. ((tX((sJlib/python2.7/site-packages/sklearn/preprocessing/_function_transformer.pyt _identity stFunctionTransformerc BsweZdZd d d eded d d„Zd„Zd„Zd d„Z dd„Z dd„Z d d d d„Z RS( sê Constructs a transformer from an arbitrary callable. A FunctionTransformer forwards its X (and optionally y) arguments to a user-defined function or function object and returns the result of this function. This is useful for stateless transformations such as taking the log of frequencies, doing custom scaling, etc. Note: If a lambda is used as the function, then the resulting transformer will not be pickleable. .. versionadded:: 0.17 Read more in the :ref:`User Guide `. Parameters ---------- func : callable, optional default=None The callable to use for the transformation. This will be passed the same arguments as transform, with args and kwargs forwarded. If func is None, then func will be the identity function. inverse_func : callable, optional default=None The callable to use for the inverse transformation. This will be passed the same arguments as inverse transform, with args and kwargs forwarded. If inverse_func is None, then inverse_func will be the identity function. validate : bool, optional default=True Indicate that the input X array should be checked before calling ``func``. The possibilities are: - If False, there is no input validation. - If True, then X will be converted to a 2-dimensional NumPy array or sparse matrix. If the conversion is not possible an exception is raised. .. deprecated:: 0.20 ``validate=True`` as default will be replaced by ``validate=False`` in 0.22. accept_sparse : boolean, optional Indicate that func accepts a sparse matrix as input. If validate is False, this has no effect. Otherwise, if accept_sparse is false, sparse matrix inputs will cause an exception to be raised. pass_y : bool, optional default=False Indicate that transform should forward the y argument to the inner callable. .. deprecated::0.19 check_inverse : bool, default=True Whether to check that or ``func`` followed by ``inverse_func`` leads to the original inputs. It can be used for a sanity check, raising a warning when the condition is not fulfilled. .. versionadded:: 0.20 kw_args : dict, optional Dictionary of additional keyword arguments to pass to func. inv_kw_args : dict, optional Dictionary of additional keyword arguments to pass to inverse_func. t deprecatedc CsL||_||_||_||_||_||_||_||_dS(N(tfunct inverse_functvalidatet accept_sparsetpass_yt check_inversetkw_argst inv_kw_args( tselfR R R R R RRR((sJlib/python2.7/site-packages/sklearn/preprocessing/_function_transformer.pyt__init__Qs       cCsW|jdkr+t|_tjdtƒn |j|_|jrSt|d|jƒS|S(NsEThe default validate=True will be replaced by validate=False in 0.22.R ( R tNonetTruet _validatetwarningstwarnt FutureWarningRR (RR((sJlib/python2.7/site-packages/sklearn/preprocessing/_function_transformer.pyt _check_input]s     cCsytddtd|jddƒƒ}y+t|||j|j||ƒƒƒWn!tk rttj dt ƒnXdS(s1Check that func and inverse_func are the inverse.iiids‰The provided functions are not strictly inverse of each other. If you are sure you want to proceed regardless, set 'check_inverse=False'.N( tsliceRtmaxtshapeRtinverse_transformt transformtAssertionErrorRRt UserWarning(RRt idx_selected((sJlib/python2.7/site-packages/sklearn/preprocessing/_function_transformer.pyt_check_inverse_transformjs&!  cCsK|j|ƒ}|jrG|jdkp3|jdk rG|j|ƒn|S(sFit transformer by checking X. If ``validate`` is ``True``, ``X`` will be checked. Parameters ---------- X : array-like, shape (n_samples, n_features) Input array. Returns ------- self N(RRR RR R"(RRty((sJlib/python2.7/site-packages/sklearn/preprocessing/_function_transformer.pytfitws cCsTt|tƒ s|dkr/tjdtƒn|j|d|d|jd|jƒS(sWTransform X using the forward function. Parameters ---------- X : array-like, shape (n_samples, n_features) Input array. y : (ignored) .. deprecated::0.19 Returns ------- X_out : array-like, shape (n_samples, n_features) Transformed input. RsSThe parameter y on transform() is deprecated since 0.19 and will be removed in 0.21R#R R(t isinstanceRRRtDeprecationWarningt _transformR R(RRR#((sJlib/python2.7/site-packages/sklearn/preprocessing/_function_transformer.pyR‹s  cCsTt|tƒ s|dkr/tjdtƒn|j|d|d|jd|jƒS(sWTransform X using the inverse function. Parameters ---------- X : array-like, shape (n_samples, n_features) Input array. y : (ignored) .. deprecated::0.19 Returns ------- X_out : array-like, shape (n_samples, n_features) Transformed input. Rs[The parameter y on inverse_transform() is deprecated since 0.19 and will be removed in 0.21R#R R(R%RRRR&R'R R(RRR#((sJlib/python2.7/site-packages/sklearn/preprocessing/_function_transformer.pyR¢s   cCs“|j|ƒ}|dkr$t}nt|jtƒ sF|jdkrb|j}tjdtƒnt }|||r}|fnd|rŒ|niŽS(NRsIThe parameter pass_y is deprecated since 0.19 and will be removed in 0.21(( RRRR%R RRRR&tFalse(RRR#R RR ((sJlib/python2.7/site-packages/sklearn/preprocessing/_function_transformer.pyR'¹s     N( t__name__t __module__t__doc__RR(RRRR"R$RRR'(((sJlib/python2.7/site-packages/sklearn/preprocessing/_function_transformer.pyRsA     ( RtbaseRRtutilsRt utils.testingRt externals.sixRRR(((sJlib/python2.7/site-packages/sklearn/preprocessing/_function_transformer.pyts