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[src,build] Add minimal example to demonstrate pybind11 binding #3668

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[src,build] Add minimal example to demonstrate pybind11 binding #3668

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fb479fd
[build,src] Add minimal pybind11 example
danpovey Oct 20, 2019
3db1ace
[src,build,doc] Further updates to pybind11 example
danpovey Oct 20, 2019
9499026
Use buffer protocol for vector
danpovey Oct 23, 2019
9c2070f
Makefile changes
danpovey Oct 24, 2019
3b53d97
Makefile improvement
danpovey Oct 24, 2019
95fb25f
[pybind]add float matrix using buffer_protocol (#79)
DongjiGao Oct 25, 2019
7425e64
[pybind] add matrix reader and writer and related test file (#80)
DongjiGao Nov 1, 2019
e63a99a
[pybind] add iteration for matrix reader (#82)
DongjiGao Dec 12, 2019
78c511e
Construct SubMatrix/SubVector from numpy arrays without memcpy. (#84)
csukuangfj Dec 16, 2019
ee0fdfd
Merge master into pybind11 branch (#85)
naxingyu Dec 17, 2019
29ac34b
[pybind] suppress __init__ deprecation warning (#86)
naxingyu Dec 18, 2019
8592152
[pybind] add WaveReader and WaveInfoReader (#87)
naxingyu Dec 19, 2019
c66bd34
[pybind] add pybind for fst::StdVectorFst (#88)
csukuangfj Dec 20, 2019
7d3a247
[pybind] Add pybind11 bindings for code in feat/ (#91)
naxingyu Dec 20, 2019
c61b1a5
refactor matrix/vector reader/writers and add `numpy()` to matrix/vec…
csukuangfj Dec 22, 2019
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10 changes: 7 additions & 3 deletions src/pybind/README.md
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Original file line number Diff line number Diff line change
Expand Up @@ -4,7 +4,11 @@ you can cd to here and do:
# make
# python3
>>> import kaldi_pybind as k
>>> str(k.FloatVector(10))
' [ 0 0 0 0 0 0 0 0 0 0 ]\n'
>>>
>>> import numpy as np
>>> a = k.FloatVector(10)
>>> b = np.array(a, copy_data = False)
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copy_data is an invalid argument.

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should be copy

>>> b[5:10] = 2.0
>>> str(a)
[ 0 0 0 0 0 2 2 2 2 2 ]

```
20 changes: 16 additions & 4 deletions src/pybind/kaldi_pybind.cc
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Expand Up @@ -34,13 +34,25 @@ PYBIND11_MODULE(kaldi_pybind, m) {
.value("kCopyData", kCopyData, "Copy any previously existing data")
.export_values();

py::class_<Vector<float> >(m, "FloatVector")
.def(py::init<const MatrixIndexT, MatrixResizeType>(),
py::arg("size"), py::arg("resize_type") = kSetZero)

py::class_<Vector<float> >(m, "FloatVector", pybind11::buffer_protocol())
.def_buffer([](const Vector<float> &v) -> pybind11::buffer_info {
return pybind11::buffer_info(
(void*)v.Data(),
sizeof(float),
pybind11::format_descriptor<float>::format(),
1, // num-axes
{ v.Dim() },
{ 4 }); // strides (in chars)
})
.def("Dim", &Vector<float>::Dim, "Return the dimension of the vector")
.def("__repr__",
[] (const Vector<float> &a) -> std::string {
std::ostringstream str; a.Write(str, false); return str.str();
});
})
.def(py::init<const MatrixIndexT, MatrixResizeType>(),
py::arg("size"), py::arg("resize_type") = kSetZero);

}


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