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CookingANut
Description
train_iter = gluon.data.DataLoader( mnist_train.transform_first(transformer), batch_size, shuffle=True, num_workers=4 )
when i set num_workers = 4 seems code can run through, but will appear below exception:
Exception ignored in: <function DataLoader.del at 0x7f1d7fe165e0> Traceback (most recent call last): File "/home/daemonh/miniconda3/envs/d2l/lib/python3.8/site-packages/mxnet/gluon/data/dataloader.py", line 720, in del AttributeError: 'NoneType' object has no attribute 'Pool' Exception ignored in: <function Pool.del at 0x7f1d7fe84670> Traceback (most recent call last): File "/home/daemonh/miniconda3/envs/d2l/lib/python3.8/multiprocessing/pool.py", line 268, in del File "/home/daemonh/miniconda3/envs/d2l/lib/python3.8/multiprocessing/queues.py", line 362, in put AttributeError: 'NoneType' object has no attribute 'dumps'
Does it need to focus or just common issue need to ignore, thanks you very much!
Environment
----------Python Info---------- Version : 3.8.13 Compiler : GCC 7.5.0 Build : ('default', 'Mar 28 2022 11:38:47') Arch : ('64bit', 'ELF') ----------MXNet Info----------- Version : 1.9.1 Directory : /home/daemonh/miniconda3/envs/d2l/lib/python3.8/site-packages/mxnet Commit hash file "/home/daemonh/miniconda3/envs/d2l/lib/python3.8/site-packages/mxnet/COMMIT_HASH" not found. Not installed from pre-built package or built from source. Library : ['/home/daemonh/miniconda3/envs/d2l/lib/python3.8/site-packages/mxnet/libmxnet.so'] Build features: ✔ CUDA ✔ CUDNN ✔ NCCL ✔ CUDA_RTC ✖ TENSORRT ✔ CPU_SSE ✔ CPU_SSE2 ✔ CPU_SSE3 ✖ CPU_SSE4_1 ✖ CPU_SSE4_2 ✖ CPU_SSE4A ✖ CPU_AVX ✖ CPU_AVX2 ✔ OPENMP ✖ SSE ✖ F16C ✖ JEMALLOC ✔ BLAS_OPEN ✖ BLAS_ATLAS ✖ BLAS_MKL ✖ BLAS_APPLE ✔ LAPACK ✔ MKLDNN ✔ OPENCV ✖ CAFFE ✖ PROFILER ✔ DIST_KVSTORE ✖ CXX14 ✖ INT64_TENSOR_SIZE ✔ SIGNAL_HANDLER ✖ DEBUG ✖ TVM_OP ----------System Info---------- Platform : Linux-5.10.102.1-microsoft-standard-WSL2-x86_64-with-glibc2.17 system : Linux release : 5.10.102.1-microsoft-standard-WSL2 version : #1 SMP Wed Mar 2 00:30:59 UTC 2022