Out of memory error on GPU 0. Cannot allocate 154.687744MB memory on GPU 0, 3.999756GB memory has been allocated and available memory is only 0.000000B.

Please check whether there is any other process using GPU 0.
1. If yes, please stop them, or start PaddlePaddle on another GPU.
2. If no, please decrease the batch size of your model.

(at ..\paddle\fluid\memory\allocation\cuda_allocator.cc:79)
. (at ..\paddle\fluid\imperative\tracer.cc:221)

报这个错误怎么回事