<SYSTEM_TASK:>
Solve the following problem using Python, implementing the functions described below, one line at a time
<END_TASK>
<USER_TASK:>
Description:
 def BNReLU(x, name=None):
 """ A shorthand of BatchNormalization + ReLU. """

    x = BatchNorm('bn', x)
    x = tf.nn.relu(x, name=name)
    return x