gpu：Whether to use GPU. Defaults to True.
gpu_id：The id of the GPU used. Defaults to 0.
learning_rate: Learning rate. Defaults to 0.0005.
L2: The L2 penalty of the torch optimizer. Defaults to 0.00001.
max_epoch: Maximum rounds of training. Defaults to 1.
lr_step: The patience of the torch scheduler. Defaults to 2.
lr_decay: The factor of the torch scheduler. Defaults to 0.1.
clip: The max norm of clipping gradients. Defaults to 5.0.
schedule_threshold: The threshold of the torch scheduler. Defaults to 0.001.
verbose: Output training information after training verbose times. Defaults to 10.