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24 lines
791 B
Python
24 lines
791 B
Python
# Copyright (c) ONNX Project Contributors
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# SPDX-License-Identifier: Apache-2.0
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from __future__ import annotations
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import numpy as np
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from onnx.reference.ops._op_common_window import _CommonWindow
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class HammingWindow(_CommonWindow):
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r"""Returns :math:`\\omega_n = \\alpha - \\beta \\cos \\left( \\frac{\\pi n}{N-1} \\right)` where *N* is the window length.
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See `hamming_window <https://pytorch.org/docs/stable/generated/torch.hamming_window.html>`_.
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`alpha=0.54, beta=0.46`
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"""
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def _run(self, size, output_datatype=None, periodic=None):
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ni, N_1 = self._begin(size, periodic, output_datatype)
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alpha = 25.0 / 46.0
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beta = 1 - alpha
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res = alpha - np.cos(ni * np.pi * 2 / N_1) * beta
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return self._end(size, res, output_datatype)
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