mmdetection: IndexError in pycocotools

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Describe the bug When running the image_demo.py, I get an error about numpy index.

Reproduction

python demo/image_demo.py demo/demo.jpg configs/mask_rcnn/mask_rcnn_r50_fpn_1x_coco.py     checkpoints/mask_rcnn_r50_fpn_1x_coco_20200205-d4b0c5d6.pth --device cpu

Environment

`ys.platform: linux Python: 3.7.4 (default, Aug 13 2019, 20:35:49) [GCC 7.3.0] CUDA available: True CUDA_HOME: /usr/local/cuda NVCC: Cuda compilation tools, release 10.0, V10.0.130 GPU 0: GeForce GTX 1080 Ti GCC: gcc (Ubuntu 5.4.0-6ubuntu1~16.04.12) 5.4.0 20160609 PyTorch: 1.4.0 PyTorch compiling details: PyTorch built with:

• GCC 7.3
• Intel® Math Kernel Library Version 2019.0.4 Product Build 20190411 for Intel® 64 architecture applications
• Intel® MKL-DNN v0.21.1 (Git Hash 7d2fd500bc78936d1d648ca713b901012f470dbc)
• OpenMP 201511 (a.k.a. OpenMP 4.5)
• NNPACK is enabled
• CUDA Runtime 10.1
• NVCC architecture flags: -gencode;arch=compute_37,code=sm_37;-gencode;arch=compute_50,code=sm_50;-gencode;arch=compute_60,code=sm_60;-gencode;arch=compute_61,code=sm_61;-gencode;arch=compute_70,code=sm_70;-gencode;arch=compute_75,code=sm_75;-gencode;arch=compute_37,code=compute_37
• CuDNN 7.6.3
• Magma 2.5.1
• Build settings: BLAS=MKL, BUILD_NAMEDTENSOR=OFF, BUILD_TYPE=Release, CXX_FLAGS= -Wno-deprecated -fvisibility-inlines-hidden -fopenmp -DUSE_FBGEMM -DUSE_QNNPACK -DUSE_PYTORCH_QNNPACK -O2 -fPIC -Wno-narrowing -Wall -Wextra -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-strict-overflow -Wno-strict-aliasing -Wno-error=deprecated-declarations -Wno-stringop-overflow -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 -Wno-stringop-overflow, DISABLE_NUMA=1, PERF_WITH_AVX=1, PERF_WITH_AVX2=1, PERF_WITH_AVX512=1, USE_CUDA=ON, USE_EXCEPTION_PTR=1, USE_GFLAGS=OFF, USE_GLOG=OFF, USE_MKL=ON, USE_MKLDNN=ON, USE_MPI=OFF, USE_NCCL=ON, USE_NNPACK=ON, USE_OPENMP=ON, USE_STATIC_DISPATCH=OFF,

TorchVision: 0.5.0 OpenCV: 4.2.0 MMCV: 0.5.4 MMDetection: 2.0.0+unknown MMDetection Compiler: GCC 5.4 MMDetection CUDA Compiler: 10.0

Error traceback

Traceback (most recent call last):
  File "demo/image_demo.py", line 26, in <module>
    main()
  File "demo/image_demo.py", line 22, in main
    show_result_pyplot(model, args.img, result, score_thr=args.score_thr)
  File "/root/mmdetection-master/mmdet/apis/inference.py", line 146, in show_result_pyplot
    img = model.show_result(img, result, score_thr=score_thr, show=False)
  File "/root/mmdetection-master/mmdet/models/detectors/base.py", line 211, in show_result
    mask = maskUtils.decode(segms[i]).astype(np.bool)
  File "/root/anaconda3/lib/python3.7/site-packages/pycocotools-2.0-py3.7-linux-x86_64.egg/pycocotools/mask.py", line 91, in decode
    return _mask.decode([rleObjs])[:,:,0]
  File "pycocotools/_mask.pyx", line 146, in pycocotools._mask.decode
  File "pycocotools/_mask.pyx", line 128, in pycocotools._mask._frString
IndexError: only integers, slices (`:`), ellipsis (`...`), numpy.newaxis (`None`) and integer or boolean arrays are valid indices