embedding/position.py with RuntimeError if d_model is odd

[bookong22]

such as if set d_model = 29, max_len = 10000
RuntimeError: The expanded size of the tensor (14) must match the existing size (15) at non-singleton dimension 1. Target sizes: [10000, 14]. Tensor sizes: [10000, 15]
code in this line may be fixed (line 30):
pe[:, 1::2] = torch.cos(position * div_term)

[bookong22]

modify
pe[:, 1::2] = torch.cos(position * div_term)
to
pe[:, 1::2] = torch.cos(position * div_term)[:, :d_model//2]

[cheng940929]

d_model should be a even number