Thenao tutorial–indexing

Theano and NumPy support the basic subscript method and the advanced subscript value method.

The Boolean type of masks is not supported because there is no Boolean type in Theano.

# Head file Supportimport NumPy as NP

Advanced Indexing in NumPy:

The advanced subscript value is used to get the elements in a non-tuple sequence object, typically a bdarray structure.

Commonly available methods of fetching are: Integer and Boolean

• Integer indexing

>>> x = Np.array ([[1, 2], [3, 4], [5, 6]]) >>> x[[0, 1, 2], [0, 1, 0]]array ([1, 4, 5])

• Boolean indexing

>>> x = Np.array ([1., -1., -2., 3]) >>> x[x < 0] + = 20>>> Xarray ([  1.,  18.,< C8/>3.])

NumPy The Mask operation:

>>> n = np.arange (9). Reshape (3,3) >>> n[n > 4]  # Maskarray ([5, 6, 7, 8])

Theano in mask operation:

>>> t = Theano.tensor.arange (9). Reshape ((3,3)) >>> t[t > 4].eval ()  # An array with shape (3, 3, 3) Array ([[[[0], 1, 2], [0, 1, 2], [0, 1, 2], [[0, 1, 2], [0, 1, 2], [        3,        4, 5]],       [[3, 4, 5],        [3, 4 , 5],        [3, 4, 5]], dtype=int8)

Thenao tutorial–indexing