报错：RuntimeError: Adam does not support sparse gradients, please consider SparseAdam instead

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        RuntimeError: Adam does not support sparse gradients, please consider SparseAdam instead
        分析：nn.Embedding(vocab_size, embed_dim, sparse=True)中不能等于True，必须为False
        解决：nn.Embedding(vocab_size, embed_dim, sparse=False)