mirror of
https://github.com/vale981/ray
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49 lines
1.2 KiB
Cython
49 lines
1.2 KiB
Cython
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#!python
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# cython: embedsignature=True, binding=True
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# Copyright 2016 Intel Corporation
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#
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# Licensed under the Apache License, Version 2.0 (the "License");
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# you may not use this file except in compliance with the License.
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# You may obtain a copy of the License at
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#
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# http://www.apache.org/licenses/LICENSE-2.0
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#
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# Unless required by applicable law or agreed to in writing, software
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# distributed under the License is distributed on an "AS IS" BASIS,
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# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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# See the License for the specific language governing permissions and
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# limitations under the License.
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from libc.math cimport log
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import numpy as np
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cimport numpy as np
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def masked_log(x):
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"""Compute natural logarithm while accepting nonpositive input
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For nonpositive elements, return -inf.
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Modified slightly from the original BrainIAK code to support
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Python 2.
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Parameters
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----------
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x: ndarray[T]
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Returns
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-------
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ndarray[Union[T, np.float64]]
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"""
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y = np.empty(x.shape, dtype=np.float64)
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lim = x.shape[0]
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for i in range(lim):
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if x[i] <= 0:
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y[i] = float("-inf")
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else:
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y[i] = log(x[i])
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return y
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