def train ( inputs , targets , hprev ): # inputs , outputs , controller states xs, hs, ys, ps ={}, {}, {}, {} #初始化 hs[-1]= np.copy(hprev) loss =0 #正向传播 for t in range (len(inputs)): #循环遍历 xs[t]= np.zeros(( M , B ))# one - hot 编码 for b in range(0, B): xs[t][:, b][inputs[t][b]]=1 hs[t]= np.tanh(np.dot( Wxh , xs [ t ])+ np . dot ( Whh , hs [ t -1])+ bh ) ys[ t ]= np . dot ( Why , hs [ t ])+ by #未正则化的下一个词的概率 mx = np . max ( ys [ t ], axis =0) ys[ t ]-= mx #正则化 ps[ t ]= np . exp ( ys [ t ])/ np . sum ( np . exp ( ys [ t ]), axis =0)#下一个词的概率 for b in range (0, B ): if ps [ t ][ targets [ t , b ], b ]>0: loss += -np . log ( ps[t][targets[t,b],b])给这段代码加上详细注释
时间: 2024-01-05 18:05:16 浏览: 24
```
def train(inputs, targets, hprev):
# inputs: 输入的序列
# targets: 目标序列
# hprev: 初始的隐藏状态
# 初始化变量
xs, hs, ys, ps = {}, {}, {}, {}
hs[-1] = np.copy(hprev)
loss = 0
# 正向传播
for t in range(len(inputs)):
# 将输入序列进行 one-hot 编码
xs[t] = np.zeros((M, B))
for b in range(0, B):
xs[t][:, b][inputs[t][b]] = 1
# 计算隐藏状态和输出
hs[t] = np.tanh(np.dot(Wxh, xs[t]) + np.dot(Whh, hs[t-1]) + bh)
ys[t] = np.dot(Why, hs[t]) + by
# 正则化输出得到下一个词的概率分布
mx = np.max(ys[t], axis=0)
ys[t] -= mx
ps[t] = np.exp(ys[t]) / np.sum(np.exp(ys[t]), axis=0)
# 计算损失
for b in range(0, B):
if ps[t][targets[t, b], b] > 0:
loss += -np.log(ps[t][targets[t, b], b])
```
注释中详细介绍了该函数的输入和输出参数,以及函数的主要步骤。在主要步骤中,该函数通过循环遍历输入序列,将每个输入序列都进行 one-hot 编码,然后计算出隐藏状态和输出。接着,将输出进行正则化,得到下一个词的概率分布。最后,根据预测与目标之间的交叉熵损失,计算出总的损失。