TensorFlow의 설치 및 기본적인 operation

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TensorFlow

• TensorFlow is an open source software library for numerical computation using flow graphs.
• Python

What is a Data Flow Graph

• Nodes in the graph represent mathematical operations
• Edges represent the multidimensional data arrays (tensors) communicated between them.

TensorflowMechanics

1. Build graph using Tensorflow operations
2. feed data and run graph(operation) ex)sess.run(op)
3. update variables in the graph(and return values)

Tensor Ranks(차원), Shapes(요소 갯수), and Types

• Rank : 0 - Scalar ex) s = 483, 1 - Vector ex) v = [1.1, 2.2, 3.3] : 2 - Matrix ex) m = [[1,2,3],[4,5,6],[7,8,9]] : 3 - 3-Tensor , n - n-Tensor ...
• Shapes : 0 - [] , 1 - [D0], 2 - [D0, D1], 3 - [D0, D1, D2]
• Types : DT_FLOAT - tf.float32, DT_INT32 - tf.int32