317 lines
11 KiB
Python
317 lines
11 KiB
Python
"""Compatibility fixes for older version of python, numpy and scipy
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If you add content to this file, please give the version of the package
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at which the fixe is no longer needed.
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"""
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# Authors: Emmanuelle Gouillart <emmanuelle.gouillart@normalesup.org>
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# Gael Varoquaux <gael.varoquaux@normalesup.org>
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# Fabian Pedregosa <fpedregosa@acm.org>
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# Lars Buitinck
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#
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# License: BSD 3 clause
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import inspect
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import warnings
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import numpy as np
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import scipy.sparse as sp
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import scipy
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def _parse_version(version_string):
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version = []
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for x in version_string.split('.'):
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try:
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version.append(int(x))
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except ValueError:
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# x may be of the form dev-1ea1592
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version.append(x)
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return tuple(version)
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np_version = _parse_version(np.__version__)
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sp_version = _parse_version(scipy.__version__)
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try:
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from scipy.special import expit # SciPy >= 0.10
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with np.errstate(invalid='ignore', over='ignore'):
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if np.isnan(expit(1000)): # SciPy < 0.14
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raise ImportError("no stable expit in scipy.special")
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except ImportError:
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def expit(x, out=None):
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"""Logistic sigmoid function, ``1 / (1 + exp(-x))``.
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See sklearn.utils.extmath.log_logistic for the log of this function.
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"""
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if out is None:
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out = np.empty(np.atleast_1d(x).shape, dtype=np.float64)
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out[:] = x
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# 1 / (1 + exp(-x)) = (1 + tanh(x / 2)) / 2
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# This way of computing the logistic is both fast and stable.
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out *= .5
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np.tanh(out, out)
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out += 1
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out *= .5
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return out.reshape(np.shape(x))
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# little danse to see if np.copy has an 'order' keyword argument
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if 'order' in inspect.getargspec(np.copy)[0]:
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def safe_copy(X):
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# Copy, but keep the order
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return np.copy(X, order='K')
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else:
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# Before an 'order' argument was introduced, numpy wouldn't muck with
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# the ordering
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safe_copy = np.copy
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try:
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if (not np.allclose(np.divide(.4, 1, casting="unsafe"),
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np.divide(.4, 1, casting="unsafe", dtype=np.float))
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or not np.allclose(np.divide(.4, 1), .4)):
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raise TypeError('Divide not working with dtype: '
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'https://github.com/numpy/numpy/issues/3484')
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divide = np.divide
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except TypeError:
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# Compat for old versions of np.divide that do not provide support for
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# the dtype args
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def divide(x1, x2, out=None, dtype=None):
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out_orig = out
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if out is None:
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out = np.asarray(x1, dtype=dtype)
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if out is x1:
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out = x1.copy()
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else:
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if out is not x1:
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out[:] = x1
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if dtype is not None and out.dtype != dtype:
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out = out.astype(dtype)
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out /= x2
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if out_orig is None and np.isscalar(x1):
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out = np.asscalar(out)
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return out
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try:
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np.array(5).astype(float, copy=False)
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except TypeError:
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# Compat where astype accepted no copy argument
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def astype(array, dtype, copy=True):
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if array.dtype == dtype:
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return array
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return array.astype(dtype)
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else:
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astype = np.ndarray.astype
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try:
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with warnings.catch_warnings(record=True):
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# Don't raise the numpy deprecation warnings that appear in
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# 1.9, but avoid Python bug due to simplefilter('ignore')
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warnings.simplefilter('always')
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sp.csr_matrix([1.0, 2.0, 3.0]).max(axis=0)
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except (TypeError, AttributeError):
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# in scipy < 14.0, sparse matrix min/max doesn't accept an `axis` argument
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# the following code is taken from the scipy 0.14 codebase
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def _minor_reduce(X, ufunc):
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major_index = np.flatnonzero(np.diff(X.indptr))
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if X.data.size == 0 and major_index.size == 0:
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# Numpy < 1.8.0 don't handle empty arrays in reduceat
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value = np.zeros_like(X.data)
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else:
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value = ufunc.reduceat(X.data, X.indptr[major_index])
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return major_index, value
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def _min_or_max_axis(X, axis, min_or_max):
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N = X.shape[axis]
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if N == 0:
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raise ValueError("zero-size array to reduction operation")
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M = X.shape[1 - axis]
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mat = X.tocsc() if axis == 0 else X.tocsr()
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mat.sum_duplicates()
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major_index, value = _minor_reduce(mat, min_or_max)
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not_full = np.diff(mat.indptr)[major_index] < N
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value[not_full] = min_or_max(value[not_full], 0)
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mask = value != 0
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major_index = np.compress(mask, major_index)
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value = np.compress(mask, value)
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from scipy.sparse import coo_matrix
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if axis == 0:
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res = coo_matrix((value, (np.zeros(len(value)), major_index)),
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dtype=X.dtype, shape=(1, M))
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else:
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res = coo_matrix((value, (major_index, np.zeros(len(value)))),
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dtype=X.dtype, shape=(M, 1))
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return res.A.ravel()
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def _sparse_min_or_max(X, axis, min_or_max):
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if axis is None:
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if 0 in X.shape:
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raise ValueError("zero-size array to reduction operation")
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zero = X.dtype.type(0)
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if X.nnz == 0:
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return zero
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m = min_or_max.reduce(X.data.ravel())
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if X.nnz != np.product(X.shape):
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m = min_or_max(zero, m)
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return m
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if axis < 0:
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axis += 2
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if (axis == 0) or (axis == 1):
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return _min_or_max_axis(X, axis, min_or_max)
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else:
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raise ValueError("invalid axis, use 0 for rows, or 1 for columns")
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def sparse_min_max(X, axis):
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return (_sparse_min_or_max(X, axis, np.minimum),
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_sparse_min_or_max(X, axis, np.maximum))
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else:
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def sparse_min_max(X, axis):
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return (X.min(axis=axis).toarray().ravel(),
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X.max(axis=axis).toarray().ravel())
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try:
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from numpy import argpartition
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except ImportError:
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# numpy.argpartition was introduced in v 1.8.0
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def argpartition(a, kth, axis=-1, kind='introselect', order=None):
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return np.argsort(a, axis=axis, order=order)
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try:
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from itertools import combinations_with_replacement
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except ImportError:
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# Backport of itertools.combinations_with_replacement for Python 2.6,
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# from Python 3.4 documentation (http://tinyurl.com/comb-w-r), copyright
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# Python Software Foundation (https://docs.python.org/3/license.html)
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def combinations_with_replacement(iterable, r):
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# combinations_with_replacement('ABC', 2) --> AA AB AC BB BC CC
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pool = tuple(iterable)
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n = len(pool)
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if not n and r:
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return
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indices = [0] * r
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yield tuple(pool[i] for i in indices)
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while True:
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for i in reversed(range(r)):
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if indices[i] != n - 1:
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break
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else:
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return
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indices[i:] = [indices[i] + 1] * (r - i)
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yield tuple(pool[i] for i in indices)
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try:
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from numpy import isclose
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except ImportError:
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def isclose(a, b, rtol=1.e-5, atol=1.e-8, equal_nan=False):
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"""
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Returns a boolean array where two arrays are element-wise equal within
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a tolerance.
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This function was added to numpy v1.7.0, and the version you are
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running has been backported from numpy v1.8.1. See its documentation
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for more details.
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"""
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def within_tol(x, y, atol, rtol):
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with np.errstate(invalid='ignore'):
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result = np.less_equal(abs(x-y), atol + rtol * abs(y))
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if np.isscalar(a) and np.isscalar(b):
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result = bool(result)
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return result
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x = np.array(a, copy=False, subok=True, ndmin=1)
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y = np.array(b, copy=False, subok=True, ndmin=1)
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xfin = np.isfinite(x)
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yfin = np.isfinite(y)
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if all(xfin) and all(yfin):
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return within_tol(x, y, atol, rtol)
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else:
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finite = xfin & yfin
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cond = np.zeros_like(finite, subok=True)
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# Since we're using boolean indexing, x & y must be the same shape.
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# Ideally, we'd just do x, y = broadcast_arrays(x, y). It's in
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# lib.stride_tricks, though, so we can't import it here.
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x = x * np.ones_like(cond)
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y = y * np.ones_like(cond)
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# Avoid subtraction with infinite/nan values...
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cond[finite] = within_tol(x[finite], y[finite], atol, rtol)
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# Check for equality of infinite values...
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cond[~finite] = (x[~finite] == y[~finite])
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if equal_nan:
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# Make NaN == NaN
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cond[np.isnan(x) & np.isnan(y)] = True
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return cond
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if np_version < (1, 7):
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# Prior to 1.7.0, np.frombuffer wouldn't work for empty first arg.
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def frombuffer_empty(buf, dtype):
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if len(buf) == 0:
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return np.empty(0, dtype=dtype)
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else:
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return np.frombuffer(buf, dtype=dtype)
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else:
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frombuffer_empty = np.frombuffer
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if np_version < (1, 8):
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def in1d(ar1, ar2, assume_unique=False, invert=False):
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# Backport of numpy function in1d 1.8.1 to support numpy 1.6.2
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# Ravel both arrays, behavior for the first array could be different
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ar1 = np.asarray(ar1).ravel()
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ar2 = np.asarray(ar2).ravel()
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# This code is significantly faster when the condition is satisfied.
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if len(ar2) < 10 * len(ar1) ** 0.145:
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if invert:
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mask = np.ones(len(ar1), dtype=np.bool)
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for a in ar2:
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mask &= (ar1 != a)
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else:
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mask = np.zeros(len(ar1), dtype=np.bool)
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for a in ar2:
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mask |= (ar1 == a)
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return mask
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# Otherwise use sorting
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if not assume_unique:
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ar1, rev_idx = np.unique(ar1, return_inverse=True)
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ar2 = np.unique(ar2)
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ar = np.concatenate((ar1, ar2))
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# We need this to be a stable sort, so always use 'mergesort'
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# here. The values from the first array should always come before
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# the values from the second array.
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order = ar.argsort(kind='mergesort')
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sar = ar[order]
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if invert:
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bool_ar = (sar[1:] != sar[:-1])
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else:
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bool_ar = (sar[1:] == sar[:-1])
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flag = np.concatenate((bool_ar, [invert]))
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indx = order.argsort(kind='mergesort')[:len(ar1)]
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if assume_unique:
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return flag[indx]
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else:
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return flag[indx][rev_idx]
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else:
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from numpy import in1d
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if sp_version < (0, 15):
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# Backport fix for scikit-learn/scikit-learn#2986 / scipy/scipy#4142
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from ._scipy_sparse_lsqr_backport import lsqr as sparse_lsqr
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else:
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from scipy.sparse.linalg import lsqr as sparse_lsqr
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