小行星

热爱平淡，向往未知

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:set tabstop=2      " To match the sample file
:set noexpandtab    " Use tabs, not spaces
:%retab!            " Retabulate the whole file

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import binascii


filePath = "mysong.mp3"
file = open(filePath, "rb")
with file:
    byte = file.read(1)
    hexadecimal = binascii.hexlify(byte)
    decimal = int(hexadecimal, 16)
    binary = bin(decimal)[2:].zfill(8)
    print("hex: %s, decimal: %s, binary: %s" % (hexadecimal, decimal, binary))

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c函数

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#include <Python.h>

int great_function(int a) {
return a + 1;
}

static PyObject * _great_function(PyObject *self, PyObject *args) {
int _a;
int res;
if (!PyArg_ParseTuple(args, "i", &_a))
return NULL;
    res = great_function(_a);
return PyLong_FromLong(res);
}

static PyMethodDef GreateModuleMethods[] = {
    {
         "great_function",
         _great_function,
         METH_VARARGS,
         ""
    },
    {NULL, NULL, 0, NULL}
};

static struct PyModuleDef great_module = {
  PyModuleDef_HEAD_INIT,
"great_module",
  NULL,
  -1,
  GreateModuleMethods
};

PyMODINIT_FUNC PyInit_great_module(void)
{
  PyObject *m;
  m = PyModule_Create(&great_module);
if (m == NULL)
return NULL;
  printf("init great_module module\n");
return m;
}
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#include <Python.h>

int great_function(int a) {
return a + 1;
}

static PyObject * _great_function(PyObject *self, PyObject *args) {
int _a;
int res;
if (!PyArg_ParseTuple(args, "i", &_a))
return NULL;
    res = great_function(_a);
return PyLong_FromLong(res);
}

static PyMethodDef GreateModuleMethods[] = {
    {
         "great_function",
         _great_function,
         METH_VARARGS,
         ""
    },
    {NULL, NULL, 0, NULL}
};

static struct PyModuleDef great_module = {
  PyModuleDef_HEAD_INIT,
"great_module",
  NULL,
  -1,
  GreateModuleMethods
};

PyMODINIT_FUNC PyInit_great_module(void)
{
  PyObject *m;
  m = PyModule_Create(&great_module);
if (m == NULL)
return NULL;
  printf("init great_module module\n");
return m;
}

setup.py

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from setuptools import setup, Extension

great_module = Extension('great_module', sources=["great_module.c"])
setup(ext_modules=[great_module])

或者是用gcc

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g++ -fPIC -shared great_class_wrap.cxx -o _great_class.so  -I/usr/include/python2.7/ -lpython2.7

原始的c函数文件

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#include <Python.h>

int great_function(int a) {
    return a + 1;
}

static PyObject * _great_function(PyObject *self, PyObject *args)
{
    int _a;
    int res;

    if (!PyArg_ParseTuple(args, "i", &_a))
        return NULL;
    res = great_function(_a);
    return PyLong_FromLong(res);
}

static PyMethodDef GreateModuleMethods[] = {
    {
        "great_function",
        _great_function,
        METH_VARARGS,
        ""
    },
    {NULL, NULL, 0, NULL}
};

PyMODINIT_FUNC initgreat_module(void) {
    (void) Py_InitModule("great_module", GreateModuleMethods);
}
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gcc -fPIC -shared great_module.c -o great_module.so -I/home/xxx/miniconda2/envs/env3.6/include/python3.6m -lpython3.6m

多个参数

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#include <Python.h>

int great_function(int a, int b) {
return a + b;
}

static PyObject * _great_function(PyObject *self, PyObject *args) {
int _a;
int _b;
int res;
if (!PyArg_ParseTuple(args, "ii", &_a, &_b))
return NULL;
    res = great_function(_a, _b);
return PyLong_FromLong(res);
}

static PyMethodDef GreateModuleMethods[] = {
    {
         "great_function",
         _great_function,
         METH_VARARGS,
         ""
    },
    {NULL, NULL, 0, NULL}
};

static struct PyModuleDef great_module = {
  PyModuleDef_HEAD_INIT,
"great_module",
  NULL,
  -1,
  GreateModuleMethods
};

PyMODINIT_FUNC PyInit_great_module(void)
{
  PyObject *m;
  m = PyModule_Create(&great_module);
if (m == NULL)
return NULL;
  printf("init great_module module\n");
return m;
}

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$F^n$ 的操作和矩阵的特征根有关系，如果特征根不是和1接近，那么对于RNN来说
梯度会爆炸。 因为里面包含了多个这样的操作。

然后正交矩阵的特征根都是1/-1, 所以能比较好的保持这种性质。

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图片放大缩小

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ffmpeg -i input.jpg -vf scale=320:240 output_320x240.png
ffmpeg -i input.jpg -vf scale=320:-1 output_320.png

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x = Variable(torch.cat((torch.ones(1, 1, 10, 10), torch.ones(1, 1, 10, 10)*2), dim=0))
softmax = nn.Softmax(dim=1)
y = softmax(x.view(2, -1)).view(2, 1, 10, 10)

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配置

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[distutils]
index-servers =
    pypi

[pypi]
repository: https://upload.pypi.org/legacy/
username: xxx
password: xxx

打包

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python setup.py sdist

上传

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pip install twine
twine upload dist/*

更新

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rm -rf dist
python setup.py sdist
twine upload dist/*