I’m facing some problems getting an array into the right shape to use it as an input into a convolutional neural net:
My array has the shape (100,64,64)
, but I’d need it to be (100,64,64,1)
. I realize it looks a bit odd, but I basically want to pack every single entry into a separate array.
A simplified example, with a 2D array, where the analogous would be from (3,3)
to (3,3,1)
:
[[0,1,0], [[[0],[1],[0]], [1,1,1], [[1],[1],[1]], [0,0,1]] [[0],[0],[1]]]
Is there a convenient way to do this using numpy?
I’ve tried to use the function numpy.reshape
: With which I know, how to “add” another array wrapping the original one.
import numpy as np data = data.reshape((1,)+data.shape)
This gives the output for data.shape
: (1,100,64,64)
.
Is there a way to add a dimension at the “inner end”?
If I try data.reshape(data.shape+(,1))
, I get an invalid syntax error.
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Answer
You can reshape using:
a[:,:,None]
Or, programmatically (works for any number of dimensions):
a.reshape((*a.shape,1))
example
a = np.array([[0,1,0], [1,1,1], [0,0,1]]) # array([[0, 1, 0], # [1, 1, 1], # [0, 0, 1]]) a[:,:,None] # or a.reshape((*a.shape,1)) # array([[[0], [1], [0]], # [[1], [1], [1]], # [[0], [0], [1]]])