Modify the value of num worker to solve the performance degradation problem of PP-TSM (#561)

Author: mengmingooo

configs/recognition/pptsm/pptsm_k400_frames_uniform.yaml

@@ -14,7 +14,7 @@ MODEL: #MODEL field
 
 DATASET: #DATASET field
     batch_size: 16  #Mandatory, bacth size
-    num_workers: 4 #Mandatory, the number of subprocess on each GPU.
+    num_workers: 5 #Mandatory, the number of subprocess on each GPU.
     train:
         format: "FrameDataset" #Mandatory, indicate the type of dataset, associate to the 'paddlevidel/loader/dateset'
         data_prefix: "data/k400/rawframes" #Mandatory, train data root path