getting started tensorflow

ÅÙ¼­Ç÷οìÀÇ Æ¯Â¡Àº ´ÙÀ½°ú °°´Ù.
  • ¿¬»êÀº ±×·¡ÇÁ·Î Ç¥ÇöÇÑ´Ù.
  • ±×·¡ÇÁ´Â ¼¼¼Ç¿¡¼­ ½ÇÇà µÈ´Ù.
  • µ¥ÀÌÅÍ´Â tensor·Î Ç¥ÇöÇÑ´Ù.
  • º¯¼ö(Variable)´Â ¿©·¯ ±×·¡ÇÁµéÀÌ ½ÇÇàµÉ¶§µµ »óŸ¦ À¯ÁöÇÑ´Ù.
ÅÙ¼­Ç÷οì´Â ±âº»ÀûÀΠ󸮼ø¼­´Â ´ÙÀ½°ú °°´Ù.

1. ÅÙ¼­Ç÷οì ÀÓÆ÷Æ®
2. Ç÷¹À̽ºÈ¦´õ Á¤ÀÇ
3. ÀÔ·Â µ¥ÀÌÅÍ Á¤ÀÇ
4. W, b º¯¼ö Á¤ÀÇ
5. ¸ðµ¨ ¼ö½Ä Á¤ÀÇ
6. ¼¼¼Ç »ý
7. ±Û·Îºí º¯¼ö ÃʱâÈ­ ¼¼¼Ç ½ÇÇà
8. ±×·¡ÇÁ ¼ö½Ä ¼¼¼Ç ½ÇÇà
9. ¼¼¼Ç ´Ý±â

import tensorflow as tf   //1. ÅÙ¼­Ç÷οì ÀÓÆ÷Æ®

X = tf.placeholder(dtype=tf.float32) //2. Ç÷¹À̽ºÈ¦´õ Á¤ÀÇ
x_data = [1, 2, 3, 4, 5]  //3. ÀÔ·Â µ¥ÀÌÅÍ Á¤ÀÇ

W = tf.Variable([10], dtype=tf.float32) //4. W, b º¯ Á¤ÀÇ
b = tf.Variable([0], dtype=tf.float32) 

expr = X*W + b  //5. ¸ðµ¨ ¼ö½Ä Á¤ÀÇ

sess = tf.Session()   //6. ¼¼¼Ç »ý¼º
sess.run(tf.global_variables_initializer())  //7. ±Û·Îºí º¯¼ö ÃʱâÈ­ ¼¼¼Ç ½ÇÇà

print(sess.run(expr, feed_dict={X: x_data}))  //8. ±×·¡ÇÁ ¼ö½Ä ¼¼¼Ç ½ÇÇà
sess.close()  //9. ¼¼¼Ç ´Ý±â


1. ÅÙ¼­Ç÷οì ÀÓÆ÷Æ®

import tensorflow as tf
ÅÙ¼­Ç÷ο츦 »ç¿ëÇϱâ À§ÇØ tensorflow¸¦ ÀÓÆ÷Æ® ÇÑ´Ù.

2. Ç÷¹À̽ºÈ¦´õ Á¤ÀÇ

placeholder´Â ÀԷ°ªÀ» ¹Þ±â À§ÇÑ ¸Å°³º¯¼ö·Î Á¤ÀÇÇϴ°ÍÀ¸·Î »ý°¢ÇÏ¸é µÈ´Ù.

3. ÀÔ·Â µ¥ÀÌÅÍ Á¤ÀÇ

x_data = [1, 2, 3, 4, 5]
placeholder X¿¡ ÀÔ·ÂÇÒ µ¥ÀÌÅ͸¦ Á¤ÀÇÇÑ´Ù.

4. W, b º¯¼ö Á¤ÀÇ

W = tf.Variable([10], dtype=tf.float32)
b = tf.Variable([0], dtype=tf.float32)

º¯¼ö¸¦ Á¤ÀÇÇÏ°í W = 10, b = 0À» ÀÔ·ÂÇÑ´Ù.

5. ¸ðµ¨ ¼ö½Ä Á¤ÀÇ

expr = X*W + b
±×·¡ÇÁÀÇ ¿¬»êÀ» Ç¥ÇöÇÑ´Ù.

6. ¼¼¼Ç »ý¼º

¼¼¼ÇÀ» »ý¼ºÇؼ­ ÅÙ¼­ÇÃ·Î¿ì ±×·¡ÇÁ¸¦ ½ÇÇàÇÒ Áغñ¸¦ ÇÑ´Ù.

7. ±Û·Îºí º¯¼ö ÃʱâÈ­ ¼¼¼Ç ½ÇÇà

global_variables_initializer() ÇÔ¼ö´Â ¾Õ¿¡¼­ Á¤ÀÇµÈ º¯¼öµéÀ» ÃʱâÈ­ ÇÑ´Ù.
±âÁ¸ ÇнÀ µ¥ÀÌÅ͸¦ »ç¿ëÇÏÁö ¾Ê°í óÀ½ ½ÇÇàÇÑ´Ù¸é ¹Ýµå½Ã ÃʱâÈ­ ÇØ¾ß ÇÑ´Ù.

8. ±×·¡ÇÁ ¼ö½Ä ¼¼¼Ç ½ÇÇà

¼¼¼ÇÀ» ½ÇÇàÇÏ¸é ±×·¡ÇÁ ¿¬»êÀÌ ½ÇÇàÀÌ µÈ´Ù.

sess.run()
±×·¡ÇÁ¸¦ ½ÇÇàÇÑ´Ù.

feed_dict={X: x_data}
feed_dict ¸Å°³º¯¼ö·Î ±×·¡ÇÁ¸¦ ½ÇÇàÇÒ¶§ placeholderÀÇ ÀԷ°ªÀ» ÁöÁ¤ÇÑ´Ù.


9. ¼¼¼Ç ´Ý±â

sess.close()
ÅÙ¼­Ç÷ο츦 ´Ý´Â´Ù.

°á°ú
[10. 20. 30. 40. 50.]

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Á¶´ëÇù´ÔÀÇ ÅÙ¼­Ç÷οì-#1 ÀÚ·áÇüÀÇ ÀÌÇØ
http://bcho.tistory.com/m/1150

ÅÙ¼­Ç÷οì Æ©Å丮¾ó
https://tensorflowkorea.gitbooks.io/tensorflow-kr/content/g3doc/get_started/basic_usage.html

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