[Bug] Wrong head_position index in rc_position_embedding.py

[Tong Li]

In rc_position_embedding.py line 69:

head_position_vector = paddle.to_tensor(rc_vector[:, :, -1], dtype='int64')

But in rc_init_vector.py line 208, the head_position_idx is -2 in rc_embedding.

So I think it should be:

head_position_vector = paddle.to_tensor(rc_vector[:, :, -2], dtype='int64')

[Yaqing Wang]

Thanks!
You are right. We now fix it.