Running Detectron2 after installing via Conda

[bryanherman]

I am having trouble running Detectron2 after installing via Conda using the following command:

conda create -n det4 -c iopath -c fvcore -c conda-forge -c main detectron2 jupyter opencv pytorch python=3.8 fvcore torchvision

After a successful install, I activate the conda environment and open an Python shell and try to execute:

>>> from detectron2.data.detection_utils import read_image

upon which I get the following error:

Traceback (most recent call last):
  File "<stdin>", line 1, in <module>
  File "/home/bherman/.conda/envs/det4/lib/python3.8/site-packages/detectron2/data/__init__.py", line 4, in <module>
    from .build import (
  File "/home/bherman/.conda/envs/det4/lib/python3.8/site-packages/detectron2/data/build.py", line 12, in <module>
    from detectron2.structures import BoxMode
  File "/home/bherman/.conda/envs/det4/lib/python3.8/site-packages/detectron2/structures/__init__.py", line 6, in <module>
    from .keypoints import Keypoints, heatmaps_to_keypoints
  File "/home/bherman/.conda/envs/det4/lib/python3.8/site-packages/detectron2/structures/keypoints.py", line 6, in <module>
    from detectron2.layers import interpolate
  File "/home/bherman/.conda/envs/det4/lib/python3.8/site-packages/detectron2/layers/__init__.py", line 3, in <module>
    from .deform_conv import DeformConv, ModulatedDeformConv
  File "/home/bherman/.conda/envs/det4/lib/python3.8/site-packages/detectron2/layers/deform_conv.py", line 10, in <module>
    from detectron2 import _C
ImportError: /home/bherman/.conda/envs/det4/lib/python3.8/site-packages/detectron2/_C.cpython-38-x86_64-linux-gnu.so: undefined symbol: _ZN6caffe28TypeMeta21_typeMetaDataInstanceIN3c108BFloat16EEEPKNS_6detail12TypeMetaDataEv

From the Installation documentation, I ran the following command:

gdb -ex "r" -ex "bt" -ex "quit" --args python -m detectron2.utils.collect_env

GNU gdb (GDB) Red Hat Enterprise Linux 7.6.1-120.el7
Copyright (C) 2013 Free Software Foundation, Inc.
License GPLv3+: GNU GPL version 3 or later <http://gnu.org/licenses/gpl.html>
This is free software: you are free to change and redistribute it.
There is NO WARRANTY, to the extent permitted by law.  Type "show copying"
and "show warranty" for details.
This GDB was configured as "x86_64-redhat-linux-gnu".
For bug reporting instructions, please see:
<http://www.gnu.org/software/gdb/bugs/>...
Reading symbols from /home/bherman/.conda/envs/det4/bin/python3.8...done.
Starting program: /home/bherman/.conda/envs/det4/bin/python -m detectron2.utils.collect_env
[Thread debugging using libthread_db enabled]
Using host libthread_db library "/lib64/libthread_db.so.1".
[Detaching after fork from child process 20862]
[Detaching after fork from child process 20869]
[Detaching after fork from child process 20870]
[Detaching after fork from child process 20871]
---------------------  -------------------------------------------------------------------------------
sys.platform           linux
Python                 3.8.8 | packaged by conda-forge | (default, Feb 20 2021, 16:22:27) [GCC 9.3.0]
numpy                  1.20.2
detectron2             0.2 @/home/bherman/.conda/envs/det4/lib/python3.8/site-packages/detectron2
detectron2._C          failed to import
Compiler               c++ (GCC) 4.8.5 20150623 (Red Hat 4.8.5-44)
DETECTRON2_ENV_MODULE  <not set>
PyTorch                1.8.0 @/home/bherman/.conda/envs/det4/lib/python3.8/site-packages/torch
PyTorch debug build    False
GPU available          False
Pillow                 8.1.2
torchvision            0.9.0a0 @/home/bherman/.conda/envs/det4/lib/python3.8/site-packages/torchvision
fvcore                 0.1.5.post20210330
---------------------  -------------------------------------------------------------------------------
PyTorch built with:
  - GCC 7.5
  - C++ Version: 201402
  - Intel(R) Math Kernel Library Version 2020.0.4 Product Build 20200917 for Intel(R) 64 architecture applications
  - OpenMP 201511 (a.k.a. OpenMP 4.5)
  - NNPACK is enabled
  - CPU capability usage: AVX2
  - Build settings: BLAS_INFO=mkl, BUILD_TYPE=Release, CXX_COMPILER=/home/conda/feedstock_root/build_artifacts/pytorch-recipe_1615249494997/_build_env/bin/x86_64-conda-linux-gnu-c++, CXX_FLAGS=-std=c++14 -fmessage-length=0 -march=nocona -mtune=haswell -ftree-vectorize -fPIC -fstack-protector-strong -fno-plt -O2 -ffunction-sections -pipe -isystem /home/conda/feedstock_root/build_artifacts/pytorch-recipe_1615249494997/_h_env_placehold_placehold_placehold_placehold_placehold_placehold_placehold_placehold_placehold_placehold_placehold_placehold_placehold_placehold_placehold_placehold_placehold_placeh/include -fdebug-prefix-map=/home/conda/feedstock_root/build_artifacts/pytorch-recipe_1615249494997/work=/usr/local/src/conda/pytorch-1.8.0 -fdebug-prefix-map=/home/conda/feedstock_root/build_artifacts/pytorch-recipe_1615249494997/_h_env_placehold_placehold_placehold_placehold_placehold_placehold_placehold_placehold_placehold_placehold_placehold_placehold_placehold_placehold_placehold_placehold_placehold_placeh=/usr/local/src/conda-prefix -Wno-deprecated-declarations -Wno-deprecated -fvisibility-inlines-hidden -DUSE_PTHREADPOOL -fopenmp -DNDEBUG -DUSE_FBGEMM -DUSE_QNNPACK -DUSE_PYTORCH_QNNPACK -DUSE_XNNPACK -O2 -fPIC -Wno-narrowing -Wall -Wextra -Werror=return-type -Wno-missing-field-initializers -Wno-type-limits -Wno-array-bounds -Wno-unknown-pragmas -Wno-sign-compare -Wno-unused-parameter -Wno-unused-variable -Wno-unused-function -Wno-unused-result -Wno-unused-local-typedefs -Wno-strict-overflow -Wno-strict-aliasing -Wno-error=deprecated-declarations -Wno-stringop-overflow -Wno-psabi -Wno-error=pedantic -Wno-error=redundant-decls -Wno-error=old-style-cast -fdiagnostics-color=always -faligned-new -Wno-unused-but-set-variable -Wno-maybe-uninitialized -fno-math-errno -fno-trapping-math -Werror=format -Wno-stringop-overflow, LAPACK_INFO=mkl, PERF_WITH_AVX=1, PERF_WITH_AVX2=1, PERF_WITH_AVX512=1, TORCH_VERSION=1.8.0, USE_CUDA=0, USE_CUDNN=OFF, USE_EXCEPTION_PTR=1, USE_GFLAGS=OFF, USE_GLOG=OFF, USE_MKL=ON, USE_MKLDNN=OFF, USE_MPI=OFF, USE_NCCL=OFF, USE_NNPACK=ON, USE_OPENMP=ON, 

[Inferior 1 (process 20858) exited normally]
No stack.

Can anyone help me out? Thanks in advance!

[ppwwyyxx]

Installing detectron2 from conda is not the official method we provide: https://detectron2.readthedocs.io/en/latest/tutorials/install.html. We do not know who provides it and what it contains.