embedding_size: 64              # (int) The embedding size of items.
hidden_size: 128                # (int) The number of features in the hidden state.
n_layers: 1                     # (int) The number of layers in GRU.
dropout_probs: [0.25,0.5]       # (list of float) The dropout rate for embedding and concatenation.
loss_type: 'CE'                 # (str) The type of loss function. Range in ['BPR', 'CE'].