mxnet installs but fails on import

asked 2020-07-26 00:00:25 -0500

cybervigilante gravatar image

updated 2020-07-26 10:02:14 -0500

slelievre gravatar image

I need mxnet for a linalg notebook. It installed successfully, but when I try to import it I get this error. The final error is OSError: Exec format error.

OSError                                   Traceback (most recent call last)
<ipython-input-10-1eadd2d362f9> in <module>()
----> 1 import mxnet

/opt/sagemath-9.0/local/lib/python3.7/site-packages/mxnet/__init__.py in <module>()
     22 from __future__ import absolute_import
     23 
---> 24 from .context import Context, current_context, cpu, gpu, cpu_pinned
     25 from . import engine
     26 from .base import MXNetError

/opt/sagemath-9.0/local/lib/python3.7/site-packages/mxnet/context.py in <module>()
     22 import warnings
     23 import ctypes
---> 24 from .base import classproperty, with_metaclass, _MXClassPropertyMetaClass
     25 from .base import _LIB
     26 from .base import check_call

/opt/sagemath-9.0/local/lib/python3.7/site-packages/mxnet/base.py in <module>()
    212 __version__ = libinfo.__version__
    213 # library instance of mxnet
--> 214 _LIB = _load_lib()
    215 
    216 # type definitions

/opt/sagemath-9.0/local/lib/python3.7/site-packages/mxnet/base.py in _load_lib()
    203     """Load library by searching possible path."""
    204     lib_path = libinfo.find_lib_path()
--> 205     lib = ctypes.CDLL(lib_path[0], ctypes.RTLD_LOCAL)
    206     # DMatrix functions
    207     lib.MXGetLastError.restype = ctypes.c_char_p

/opt/sagemath-9.0/local/lib/python3.7/ctypes/__init__.py in __init__(self, name, mode, handle, use_errno, use_last_error)
    354 
    355         if handle is None:
--> 356             self._handle = _dlopen(self._name, mode)
    357         else:
    358             self._handle = handle

OSError: Exec format error
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Comments

What operating system? How did you install Sage? How did you install mxnet? Do you have development tools installed?

slelievre gravatar imageslelievre ( 2020-07-26 10:03:45 -0500 )edit

The following works for me on macOS 10.14.6, with Sage 9.1.rc4 built from source.

$ sage -q
sage: !pip install mxnet
sage: import mxnet
slelievre gravatar imageslelievre ( 2020-07-27 01:19:29 -0500 )edit