File size: 3,518 Bytes
be903e2 | 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 | /* Tencent is pleased to support the open source community by making ncnn available.
*
* Copyright (C) 2020 THL A29 Limited, a Tencent company. All rights reserved.
*
* Licensed under the BSD 3-Clause License (the "License"); you may not use this file except
* in compliance with the License. You may obtain a copy of the License at
*
* https://opensource.org/licenses/BSD-3-Clause
*
* Unless required by applicable law or agreed to in writing, software distributed
* under the License is distributed on an "AS IS" BASIS, WITHOUT WARRANTIES OR
* CONDITIONS OF ANY KIND, either express or implied. See the License for the
* specific language governing permissions and limitations under the License.
*/
#ifndef PYBIND11_NCNN_MAT_H
#define PYBIND11_NCNN_MAT_H
#include <string>
#include <pybind11/pybind11.h>
#include <mat.h>
namespace py = pybind11;
std::string get_mat_format(const ncnn::Mat& m)
{
std::string format;
if (m.elemsize == 4)
{
format = pybind11::format_descriptor<float>::format();
}
if (m.elemsize == 2)
{
// see https://docs.python.org/3/library/struct.html#format-characters
format = "e";
}
if (m.elemsize == 1)
{
format = pybind11::format_descriptor<int8_t>::format();
}
return format;
}
// possible values for format:
// i (int32_t)
// f (float)
// d (double)
// leave it to empty to use get_mat_format
py::buffer_info to_buffer_info(ncnn::Mat& m, const std::string& format = "")
{
if (m.elemsize != 1 && m.elemsize != 2 && m.elemsize != 4)
{
std::ostringstream ss;
ss << "Convert ncnn.Mat to numpy.ndarray. Support only elemsize 1, 2, 4; but given "
<< m.elemsize;
py::pybind11_fail(ss.str());
}
if (m.elempack != 1)
{
std::ostringstream ss;
ss << "Convert ncnn.Mat to numpy.ndarray. Support only elempack == 1, but "
"given "
<< m.elempack;
py::pybind11_fail(ss.str());
}
std::string _format(format);
if (_format.empty())
{
_format = get_mat_format(m);
}
std::vector<py::ssize_t> shape;
std::vector<py::ssize_t> strides;
if (m.dims == 1)
{
shape.push_back(m.w);
strides.push_back(m.elemsize);
}
else if (m.dims == 2)
{
shape.push_back(m.h);
shape.push_back(m.w);
strides.push_back(m.w * m.elemsize);
strides.push_back(m.elemsize);
}
else if (m.dims == 3)
{
shape.push_back(m.c);
shape.push_back(m.h);
shape.push_back(m.w);
strides.push_back(m.cstep * m.elemsize);
strides.push_back(m.w * m.elemsize);
strides.push_back(m.elemsize);
}
else if (m.dims == 4)
{
shape.push_back(m.c);
shape.push_back(m.d);
shape.push_back(m.h);
shape.push_back(m.w);
strides.push_back(m.cstep * m.elemsize);
strides.push_back(m.w * m.h * m.elemsize);
strides.push_back(m.w * m.elemsize);
strides.push_back(m.elemsize);
}
return py::buffer_info(m.data, /* Pointer to buffer */
m.elemsize, /* Size of one scalar */
_format, /* Python struct-style format descriptor */
m.dims, /* Number of dimensions */
shape, /* Buffer dimensions */
strides /* Strides (in bytes) for each index */
);
}
#endif
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