ML lab 01 - TensorFlow의 설치및 기본적인 operations (new)

TensorFlow

• Data flow graphs를 사용해서 numerical computation을 할수있는 
• Python 오픈소스 라이브러리

 

Data Flow Graph

• Node(Operation)들이 Edge(Data, Tensors)로 연결된 작업 흐름도
• constant : node를 만든다

 

Computational Graph

 

TensowFlow Mechanics

• Build graph using tensorflow operation
• feed data and run graph : sess.run(op)
• update variables in the graph(and return value)

 

Placeholder

• 특별한 노드 not constant
• sess.run(add_node, feed_dict={a:3, b:4})
• 값을 실행할 때 넘겨 줄 수 있다

 

Everything is Tensor

• array
• rank : 몇차원 array? (scalar, vector, matrix, n-Tensor)
• shape : element가 몇개인가?
• type : 대부분 float32, int32

 

- https://www.tensorflow.org/install/pip

Install TensorFlow with pip  |  TensorFlow

- https://www.tensorflow.org/api_docs/python/tf/Graph#building_a_tfgraph

tf.Graph  |  TensorFlow Core v2.1.0

- https://github.com/hunkim/DeepLearningZeroToAll/blob/61c6c364b69a46a746000144ef81f86b88e8c2b7/ipynb/lab-01-basics.ipynb

hunkim/DeepLearningZeroToAll

brew로 python3, pip3, virtualenv 설치

virtualenv에서 컴파일 성공

import, version 확인

 

강의에 Sesstion이 deprecate됬다고 함

The TF 2.0 supports eager execution it means you need not explicitly create the session and run the code in it.

https://kodlogs.com/34085/runtimeerror-the-session-graph-is-empty-add-operations-to-the-graph-before-calling-run

Runtimeerror: the session graph is empty. add operations to the graph before calling run(). - Kodlogs

HelloWorld print 성공

https://github.com/hunkim/DeepLearningZeroToAll/blob/61c6c364b69a46a746000144ef81f86b88e8c2b7/ipynb/lab-01-basics.ipynb