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from cupy import _core |
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from cupy._math import ufunc |
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from cupy_backends.cuda.api import runtime |
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signbit = _core.create_ufunc( |
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'cupy_signbit', |
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('e->?', 'f->?', 'd->?'), |
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'out0 = signbit(in0)', |
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doc='''Tests elementwise if the sign bit is set (i.e. less than zero). |
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.. seealso:: :data:`numpy.signbit` |
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''') |
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copysign = ufunc.create_math_ufunc( |
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'copysign', 2, 'cupy_copysign', |
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'''Returns the first argument with the sign bit of the second elementwise. |
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.. seealso:: :data:`numpy.copysign` |
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''') |
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ldexp = _core.create_ufunc( |
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'cupy_ldexp', |
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('ei->e', 'fi->f', 'el->e', 'fl->f', 'di->d', 'dq->d'), |
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'out0 = ldexp(in0, in1)', |
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doc='''Computes ``x1 * 2 ** x2`` elementwise. |
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.. seealso:: :data:`numpy.ldexp` |
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''') |
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frexp = _core.create_ufunc( |
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'cupy_frexp', |
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('e->ei', 'f->fi', 'd->di'), |
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'int nptr; out0 = {}(in0, &nptr); out1 = nptr'.format( |
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'frexpf' if runtime.is_hip else 'frexp'), |
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doc='''Decomposes each element to mantissa and two's exponent. |
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This ufunc outputs two arrays of the input dtype and the ``int`` dtype. |
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.. seealso:: :data:`numpy.frexp` |
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''') |
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nextafter = ufunc.create_math_ufunc( |
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'nextafter', 2, 'cupy_nextafter', |
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'''Computes the nearest neighbor float values towards the second argument. |
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.. note:: |
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For values that are close to zero (or denormal numbers), |
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results of :func:`cupy.nextafter` may be different from those of |
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:func:`numpy.nextafter`, because CuPy sets ``-ftz=true``. |
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.. seealso:: :data:`numpy.nextafter` |
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''') |
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