例如,如何在Racket的同一'else'分支中执行三种不同的操作? 喜欢
(if (equal? temp2 #f)
#f
temp2
(vector-set! cache counter temp2)
(set! counter (+ counter 1)))
)
答案 0 :(得分:3)
将需要在cond
块中顺序执行的表达式放在(if <condition>
(begin ; consequent
exp1
exp2)
(begin ; alternative
exp3
exp4))
块中,或使用隐式使用begin块的(cond (<condition>
exp1 ; consequent
exp2)
(else
exp3 ; alternative
exp4))
表达式。像这样:
logits_train, volumes = net(images,volumes)
logits_val, v_volumes = net(v_images, v_volumes)
loss_train = some_loss(logits_train,volumes)
train_optimizer = some_optimizer(loss_train)
甚至更简单:
1. sess.run([train_optimizer]) #It uses training data (Dequeues train data)
2. sess.run([logits_val]) #It uses validation data (Dequeues validation data )