mmdetection3d: SUN RGB-D, wrong values, when creating .pkl files

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Checklist

1. I have searched related issues but cannot get the expected help.
2. The bug has not been fixed in the latest version.

Describe the bug Whenever, calibration files from the SUN RGB-D dataset are being read, MMDetection3D stores Rt values in both Rt and K fields in infos.pkl files.

Reproduction

1. What command or script did you run?

   python tools/create_data.py sunrgbd --root-path ./data/sunrgbd --out-dir ./data/sunrgbd --extra-tag sunrgbd

2. Did you make any modifications on the code or config? Did you understand what you have modified?

   Nothing was changed.

3. What dataset did you use?

   SUN RGB-D

Environment

1. Please run python mmdet3d/utils/collect_env.py to collect necessary environment infomation and paste it here.

sys.platform: linux
Python: 3.6.9 (default, Jan 26 2021, 15:33:00) [GCC 8.4.0]
CUDA available: True
GPU 0: Tesla V100-SXM2-32GB
CUDA_HOME: /usr/local/cuda
NVCC: Cuda compilation tools, release 10.1, V10.1.243
GCC: gcc (Ubuntu 7.5.0-3ubuntu1~18.04) 7.5.0
PyTorch: 1.8.0.dev20210103+cu101
PyTorch compiling details: PyTorch built with:
  - GCC 7.3
  - C++ Version: 201402
  - Intel(R) Math Kernel Library Version 2020.0.0 Product Build 20191122 for Intel(R) 64 architecture applications
  - Intel(R) MKL-DNN v1.7.0 (Git Hash 7aed236906b1f7a05c0917e5257a1af05e9ff683)
  - OpenMP 201511 (a.k.a. OpenMP 4.5)
  - NNPACK is enabled
  - CPU capability usage: AVX2
  - 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_70,code=sm_70;-gencode;arch=compute_75,code=sm_75
  - CuDNN 7.6.3
  - Magma 2.5.2
  - Build settings: BLAS_INFO=mkl, BUILD_TYPE=Release, CUDA_VERSION=10.1, CUDNN_VERSION=7.6.3, CXX_COMPILER=/opt/rh/devtoolset-7/root/usr/bin/c++, CXX_FLAGS= -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=ON, USE_CUDNN=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, 

TorchVision: 0.9.0.dev20210103+cu101
OpenCV: 4.4.0
MMCV: 1.3.1
MMCV Compiler: GCC 7.5
MMCV CUDA Compiler: 10.1
MMDetection: 2.11.0
MMDetection3D: 0.12.0+e21e61e

1. You may add addition that may be helpful for locating the problem, such as
   • How you installed PyTorch [e.g., pip, conda, source]
   • Other environment variables that may be related (such as $PATH, $LD_LIBRARY_PATH, $PYTHONPATH, etc.)

Error traceback If applicable, paste the error trackback here.

Bug fix If you have already identified the reason, you can provide the information here. If you are willing to create a PR to fix it, please also leave a comment here and that would be much appreciated!

In /tools/data_converter/sunrgbd_data_utils.py should probably make changes in this function:

def get_calibration(self, idx):
        calib_filepath = osp.join(self.calib_dir, f'{idx:06d}.txt')
        lines = [line.rstrip() for line in open(calib_filepath)]
        Rt = np.array([float(x) for x in lines[0].split(' ')])
        Rt = np.reshape(Rt, (3, 3), order='F').astype(np.float32)
        K = np.array([float(x) for x in lines[1].split(' ')])
        K = np.reshape(Rt, (3, 3), order='F').astype(np.float32)
        return K, Rt

To get this:

def get_calibration(self, idx):
        calib_filepath = osp.join(self.calib_dir, f'{idx:06d}.txt')
        lines = [line.rstrip() for line in open(calib_filepath)]
        Rt = np.array([float(x) for x in lines[0].split(' ')])
        Rt = np.reshape(Rt, (3, 3), order='F').astype(np.float32)
        K = np.array([float(x) for x in lines[1].split(' ')])
        K = np.reshape(K, (3, 3), order='F').astype(np.float32)
        return K, Rt