davisking/dlib

DLL load failed for CUDA on Python 3.8 for Windows

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#2,039 opened on Mar 28, 2020

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bughelp wanted

Description

Expected Behavior

>>> import dlib
>>> :)

Current Behavior

>>> import dlib
Traceback (most recent call last):
  File "<stdin>", line 1, in <module>
ImportError: DLL load failed while importing dlib: The specified module could not be found.
>>> :(

Steps to Reproduce

  1. Install CUDA
  2. Install cuDNN
  3. git clone https://github.com/davisking/dlib.git
  4. python setup.py install
  5. python -c"import dlib"

Because of A change in Python 3.8 for Windows, Python no longer searches for DLLs in directories listed in the PATH environment variable and fails to find curand64_10.dll, this is fixed after running os.add_dll_directory(os.path.join(os.environ['CUDA_PATH'], 'bin'))

  • Version: 19.19.99
  • Where did you get dlib: this github repo
  • Platform: Python 3.8 64-bit for Windows 10

Contributor guide

Tech stack
pythoncpp
Domain
machine learningbackend
Issue type
bug
DifficultyEstimated implementation difficulty for a new contributor, from 1 for very small changes to 5 for expert-level work.
2
Estimated timeA rough time range for an experienced contributor to investigate, implement, test, and prepare a pull request.
under 1 hour
Activity statusHow available the issue appears right now: fresh, active, stale, blocked, or waiting on maintainer input.
stale
ClarityHow clearly the issue explains the expected change, acceptance criteria, and next step.
clear
Prerequisites
Python 3.8 on WindowsCUDA and cuDNN installeddlib build process
Newbie friendlinessA 1-100 score estimating how approachable this issue is for first-time contributors.
70
Research direction
The issue is a DLL loading problem on Windows with Python 3.8 due to changes in DLL search order. The fix involves adding a call to `os.add dll directory()` in the dlib initialization code, specifically in `dlib/ init .py` or the `setup.py` to add the CUDA bin directory before importing the dlib module. The issue report explicitly states the required change, so research should focus on locating the appropriate file to add this fix.