How to do Array manipulation using chainer

This recipe helps you do Array manipulation using chainer

Recipe Objective - How to do Array manipulation using chainer?

Some of the array manipulation functions are -

chainer.functions.cast - Cast an input variable to a given type.

chainer.functions.concat - Concatenates given variables along an axis.

chainer.functions.copy - Copies the input variable onto the specified device.

chainer.functions.diagonal - Take diagonal

chainer.functions.reshape - Reshapes an input variable without copy.

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# Example 1 (Cast)
# Importing necessary libraries
import chainer
import numpy
from chainer import function_node
x = numpy.arange(0, 3, dtype=numpy.float64)
y = chainer.functions.cast(x, numpy.float32)
print(x.dtype)
print(y.dtype)

Output - 
float64
float32

# Example 2 (Diagonal)
# Importing necessary libraries
import chainer
import numpy
from chainer import function_node
x = chainer.Variable(numpy.arange(9).reshape(3, 3).astype(numpy.float32))
y = chainer.functions.diagonal(x)
print(x)
print(y)

Output - 
variable([[0. 1. 2.]
          [3. 4. 5.]
          [6. 7. 8.]])
variable([0. 4. 8.])

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