ravel

x.ravel()で一次元配列(n-size,)を返す

x.flatten()でも同様．ただしravelのほうがmemoryのコピーを行わず，flattenよりも高速になる可能性があるらしい．

x.ravel() gives (n-size,) numpy array without copying the data to new memory space. x1

The same effect is done by flatten, but it is suggested that ravel can be faster than flatten.