issue about "gpt.py" in code part of ch 4

[976213951]

In the line 66, it is supposed to be "nn.Linear(d_out, d_in)" instead of "nn.Linear(d_out, d_out)" since the linear attempts to project the dimension of the attention (d_out) back to the dimension of embedding "d_in". However, this code can work without any error report because the "d_out" is set equal to "d_in" by default.

[HeiBoWang]

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