Tensorflow element

Author: issa1106

practice18.py

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+# Tensorflow基本運作練習
+import tensorflow as tf
+
+# 距陣範例
+matrix1 = tf.constant([[2, 2]])  # 1x2
+martix2 = tf.constant([[1, 2, 3], [4, 5, 6]])  # 2x3
+product = tf.matmul(matrix1, martix2)  # 矩陣乘法 shape=(1,3)
+
+# 變數範例
+state = tf.Variable(0, name="counter")
+
+one = tf.constant(1)
+new_value = tf.add(state, one)
+update = tf.assign(state, new_value)  # 每次+1之後更新state
+
+init_op = tf.global_variables_initializer()  # 初始化
+
+# 資料輸入
+input1 = tf.placeholder(tf.float32)
+input2 = tf.placeholder(tf.float32)
+output = tf.multiply(input1, input2)
+
+# 資料輸出
+num1 = tf.constant([3])
+num2 = tf.constant([5])
+added = tf.add(num1, num2)
+multiplied = tf.multiply(num1, num2)
+
+# 執行運算
+with tf.Session() as sess:
+	# 印出矩陣範例
+	result = sess.run(product)
+	print(result)
+
+ 	# 印出變數範例
+	sess.run(init_op)
+	print(sess.run(state))
+	for _ in range(3):
+		sess.run(update)
+		print(sess.run(state))
+
+	# 執行時才將資料以dict輸入
+	print(sess.run([output], feed_dict={input1: [7], input2: [5]}))
+
+	# 直接輸出運算結果
+	operation = sess.run([added, multiplied])
+	print(operation)
+
+sess.close()