80 lines
2.6 KiB
Python
80 lines
2.6 KiB
Python
"""
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Tests for input validation functions
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"""
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import numpy as np
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from numpy.testing import assert_array_equal
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import scipy.sparse as sp
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from tempfile import NamedTemporaryFile
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from nose.tools import assert_raises, assert_true, assert_false
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from .. import (array2d, as_float_array, atleast2d_or_csr, check_arrays,
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safe_asarray)
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def test_as_float_array():
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"""
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Test function for as_float_array
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"""
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X = np.ones((3, 10), dtype=np.int32)
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X = X + np.arange(10, dtype=np.int32)
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# Checks that the return type is ok
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X2 = as_float_array(X, copy=False)
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np.testing.assert_equal(X2.dtype, np.float32)
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# Another test
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X = X.astype(np.int64)
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X2 = as_float_array(X, copy=True)
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# Checking that the array wasn't overwritten
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assert_true(as_float_array(X, False) is not X)
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# Checking that the new type is ok
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np.testing.assert_equal(X2.dtype, np.float64)
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# Here, X is of the right type, it shouldn't be modified
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X = np.ones((3, 2), dtype=np.float32)
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assert_true(as_float_array(X, copy=False) is X)
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def test_check_arrays_exceptions():
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"""Check that invalid arguments raise appropriate exceptions"""
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assert_raises(ValueError, check_arrays, [0], [0, 1])
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assert_raises(TypeError, check_arrays, 0, [0, 1])
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assert_raises(TypeError, check_arrays, [0], 0)
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assert_raises(TypeError, check_arrays, [0, 1], [0, 1], meaning_of_life=42)
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assert_raises(ValueError, check_arrays, [0], [0], sparse_format='fake')
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def test_np_matrix():
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"""
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Confirm that input validation code does not return np.matrix
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"""
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X = np.arange(12).reshape(3, 4)
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assert_false(isinstance(as_float_array(X), np.matrix))
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assert_false(isinstance(as_float_array(np.matrix(X)), np.matrix))
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assert_false(isinstance(as_float_array(sp.csc_matrix(X)), np.matrix))
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assert_false(isinstance(atleast2d_or_csr(X), np.matrix))
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assert_false(isinstance(atleast2d_or_csr(np.matrix(X)), np.matrix))
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assert_false(isinstance(atleast2d_or_csr(sp.csc_matrix(X)), np.matrix))
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assert_false(isinstance(safe_asarray(X), np.matrix))
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assert_false(isinstance(safe_asarray(np.matrix(X)), np.matrix))
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assert_false(isinstance(safe_asarray(sp.lil_matrix(X)), np.matrix))
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def test_memmap():
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"""
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Confirm that input validation code doesn't copy memory mapped arrays
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"""
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asflt = lambda x: as_float_array(x, copy=False)
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with NamedTemporaryFile(prefix='sklearn-test') as tmp:
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M = np.memmap(tmp, shape=100, dtype=np.float32)
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M[:] = 0
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for f in (array2d, np.asarray, asflt, safe_asarray):
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X = f(M)
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X[:] = 1
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assert_array_equal(X.ravel(), M)
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X[:] = 0
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