dmlc--dgl
Quan (Andy) Gan
139 行
3.6 KiB
Python
139 行
3.6 KiB
Python
# coding: utf-8
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# pylint: disable=invalid-name
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"""ctypes library and helper functions """
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from __future__ import absolute_import
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import sys
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import os
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import ctypes
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import numpy as np
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from . import libinfo
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#----------------------------
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# library loading
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#----------------------------
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if sys.version_info[0] == 3:
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string_types = (str,)
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numeric_types = (float, int, np.float32, np.int32)
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# this function is needed for python3
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# to convert ctypes.char_p .value back to python str
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py_str = lambda x: x.decode('utf-8')
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else:
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string_types = (basestring,)
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numeric_types = (float, int, long, np.float32, np.int32)
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py_str = lambda x: x
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class DGLError(Exception):
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"""Error thrown by DGL function"""
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pass # pylint: disable=unnecessary-pass
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def _load_lib():
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"""Load libary by searching possible path."""
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lib_path = libinfo.find_lib_path()
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lib = ctypes.CDLL(lib_path[0])
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dirname = os.path.dirname(lib_path[0])
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basename = os.path.basename(lib_path[0])
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# DMatrix functions
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lib.DGLGetLastError.restype = ctypes.c_char_p
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return lib, basename, dirname
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# version number
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__version__ = libinfo.__version__
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# library instance of nnvm
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_LIB, _LIB_NAME, _DIR_NAME = _load_lib()
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# The FFI mode of DGL
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_FFI_MODE = os.environ.get("DGL_FFI", "auto")
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#----------------------------
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# helper function in ctypes.
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#----------------------------
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def check_call(ret):
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"""Check the return value of C API call
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This function will raise exception when error occurs.
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Wrap every API call with this function
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Parameters
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----------
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ret : int
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return value from API calls
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"""
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if ret != 0:
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raise DGLError(py_str(_LIB.DGLGetLastError()))
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def c_str(string):
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"""Create ctypes char * from a python string
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Parameters
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----------
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string : string type
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python string
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Returns
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-------
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str : c_char_p
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A char pointer that can be passed to C API
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"""
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return ctypes.c_char_p(string.encode('utf-8'))
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def c_array(ctype, values):
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"""Create ctypes array from a python array
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Parameters
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----------
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ctype : ctypes data type
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data type of the array we want to convert to
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values : tuple or list
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data content
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Returns
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-------
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out : ctypes array
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Created ctypes array
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"""
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return (ctype * len(values))(*values)
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def decorate(func, fwrapped):
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"""A wrapper call of decorator package, differs to call time
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Parameters
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----------
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func : function
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The original function
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fwrapped : function
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The wrapped function
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"""
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import decorator
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return decorator.decorate(func, fwrapped)
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tensor_adapter_loaded = False
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def load_tensor_adapter(backend, version):
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"""Tell DGL to load a tensoradapter library for given backend and version.
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Parameters
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----------
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backend : str
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The backend (currently ``pytorch``, ``mxnet`` or ``tensorflow``).
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version : str
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The version number of the backend.
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"""
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global tensor_adapter_loaded
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version = version.split('+')[0]
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if sys.platform.startswith('linux'):
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basename = 'libtensoradapter_%s_%s.so' % (backend, version)
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elif sys.platform.startswith('darwin'):
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basename = 'libtensoradapter_%s_%s.dylib' % (backend, version)
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elif sys.platform.startswith('win'):
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basename = 'tensoradapter_%s_%s.dll' % (backend, version)
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else:
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raise NotImplementedError('Unsupported system: %s' % sys.platform)
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path = os.path.join(_DIR_NAME, 'tensoradapter', backend, basename)
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tensor_adapter_loaded = (_LIB.DGLLoadTensorAdapter(path.encode('utf-8')) == 0)
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