Python MulLayer.backward示例

示例#1

文件： buy_apple.py 项目： poketorena/deep-learning-from-scratch

from layer_naive import MulLayer

apple = 100
apple_num = 2
tax = 1.1

# layer
mul_apple_layer = MulLayer()
mul_tax_layer = MulLayer()

# forward
apple_price = mul_apple_layer.forward(apple, apple_num)
price = mul_tax_layer.forward(apple_price, tax)

print("price", price)  # 220

# backward
dprice = 1
dapple_price, dtax = mul_tax_layer.backward(dprice)
dapple, dapple_num = mul_apple_layer.backward(dapple_price)

print("dapple", dapple)  # 2.2
print("dapple_num", dapple_num)  # 110
print("dtax", dtax)  # 200

示例#2

文件： buy_apple_orange.py 项目： okudashi/deep-learning-from-scratch

apple_num = 2
orange = 150
orange_num = 3
tax = 1.1

# layer
mul_apple_layer = MulLayer()
mul_orange_layer = MulLayer()
add_apple_orange_layer = AddLayer()
mul_tax_layer = MulLayer()

# forward
apple_price = mul_apple_layer.forward(apple, apple_num)  # (1)
orange_price = mul_orange_layer.forward(orange, orange_num)  # (2)
all_price = add_apple_orange_layer.forward(apple_price, orange_price)  # (3)
price = mul_tax_layer.forward(all_price, tax)  # (4)

# backward
dprice = 1
dall_price, dtax = mul_tax_layer.backward(dprice)  # (4)
dapple_price, dorange_price = add_apple_orange_layer.backward(dall_price)  # (3
dorange, dorange_num = mul_orange_layer.backward(dorange_price)  # (2)
dapple, dapple_num = mul_apple_layer.backward(dapple_price)  # (1)

print("price:", int(price))
print("dApple:", dapple)
print("dApple_num:", int(dapple_num))
print("dOrange:", dorange)
print("dOrange_num:", int(dorange_num))
print("dTax:", dtax)

示例#3

文件： buy_apple_orange.py 项目： xiaoyangyang2/deep_learning_exercise

# Layer
mul_apple_layer = MulLayer()
mul_orange_layer = MulLayer()
add_fruit_layer = AddLayer()
mul_tax_layer = MulLayer()

# Forward
apple_price = mul_apple_layer.forward(apple, apple_num)
orange_price = mul_orange_layer.forward(orange, orange_num)
price = add_fruit_layer.forward(apple_price, orange_price)
total_price = mul_tax_layer.forward(price, tax)

# Backward
dtotal_price = 1
dprice, dtax = mul_tax_layer.backward(dtotal_price)
dapple_price, dorange_price = add_fruit_layer.backward(dprice)
dapple, dapple_num = mul_apple_layer.backward(dapple_price)
dorange, dorange_num = mul_orange_layer.backward(dorange_price)

print('apple_price: ', apple_price)
print('orange_price:', orange_price)
print('price:', price)
print('total_price:', int(total_price))
print('=' * 50)
print('dprice: ', dprice)
print('dtax: ', dtax)
print('dapple_price: ', dapple_price)
print('dorange_price: ', dorange_price)
print('dapple: ', dapple)
print('dapple_num: ', int(dapple_num))