add numpy import

run_squad.py

@@ -28,6 +28,7 @@ import os
 from tqdm import tqdm, trange
 import random
 
+import numpy as np
 import torch
 from torch.utils.data import TensorDataset, DataLoader, RandomSampler, SequentialSampler
 from torch.utils.data.distributed import DistributedSampler