np. load function add allow_pickle = True

[bigeyesung]

Two steps to generate the issues:

1. $ python batch_load_scannet_data.py 
2. $ CUDA_VISIBLE_DEVICES=0 python train.py --dataset scannet --log_dir log_scannet --num_point 40000

After step 2, It showed the error for dev datasets.
"dataloader Cannot load file containing pickled data when allow_pickle=False"

After I changed the parameters, it worked.

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