only integer scalar arrays can be converted to a scalar index

 x_reshape = x.reshape(x, (x.shape[0], -1)) # 10, 2, 3 -> 10, 6 

해결

• reshape할 배열 쓰는건 np.reshape 쓸 때.
• x.reshape 이렇게 쓸 때는 -> shape만

x_reshape = np.reshape(x, (x.shape[0], -1))

x_reshape = x.reshape(x.shape[0], -1)