26 lines
863 B
Cython
26 lines
863 B
Cython
import cython
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cimport numpy as np
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from .._shared.fused_numerics cimport np_floats
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@cython.boundscheck(False)
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@cython.wraparound(False)
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def _correlate_sparse_offsets(np_floats[:] input, Py_ssize_t[:] indices,
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Py_ssize_t[:] offsets, np_floats[:] values,
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np_floats[:] output):
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cdef Py_ssize_t i
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cdef Py_ssize_t indices_len = indices.shape[0]
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cdef Py_ssize_t value_len = values.shape[0]
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cdef Py_ssize_t off
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cdef np_floats val
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cdef Py_ssize_t vindex
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with nogil:
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for vindex in range(value_len):
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off = offsets[vindex]
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val = values[vindex]
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# this loop order optimises cache access, gives 10x speedup
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for i in range(indices_len):
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output[i] += input[indices[i] + off] * val
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