This is the syntax of a dictionary in Python, a data structure which maps an index to another object.
a = tf.placeholder(tf.float32)
{a: [1,3]}
In this case, a
is a Tensor
from Tensorflow and [1,3]
are the values it will assume when the graph is executed.
IMO, you should invest your time into acquiring a better understanding of elementary data structures and syntax from Python before diving into Tensorflow.
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solved Python use of a:[1,3]? [closed]