这是我在试图修复的原代码的semplification。 我发明了反映了原来的代码不和，给了我同样的错误，但写在一个最小的形式的问题：
import theano
import theano.tensor as T
import numpy as np
import copy
theano.config.exception_verbosity = 'high'
class Test(object):
def __init__(self):
self.rate=0.01
def start(self, x, y):
W_val=40.89
W=theano.shared(value=W_val, borrow=True)
z=T.mean(x*W/y)
gz=T.grad(z, W)
updates=[(W, W-self.rate*gz)]
fz=theano.function([], z, updates=updates)
for i in range(100):
out=fz()
self.out=out
return out
x_set=np.random.rand(10)
y_set=np.random.randint(low=0, high=5, size=10, dtype=int)
batch_size=2
x = T.dvector('x')
y = T.ivector('y')
index = T.lscalar()
test = Test()
cost=test.start(x,y)
train = theano.function(
inputs=[index],
outputs=cost,
givens={
x: x_set[index * batch_size: (index + 1) * batch_size],
y: y_set[index * batch_size: (index + 1) * batch_size]
}
)
for i in range(5):
result=train(i)
print(result)
这是回溯：
Traceback (most recent call last):
File "functions.py", line 33, in <module>
cost=test.start(x,y)
File "functions.py", line 18, in start
fz=theano.function([], z, updates=updates)
File "C:\Program Files\Anaconda3\lib\site-packages\theano\compile\function.py", line 320, in function
output_keys=output_keys)
File "C:\Program Files\Anaconda3\lib\site-packages\theano\compile\pfunc.py", line 479, in pfunc
output_keys=output_keys)
File "C:\Program Files\Anaconda3\lib\site-packages\theano\compile\function_module.py", line 1776, in orig_function
output_keys=output_keys).create(
File "C:\Program Files\Anaconda3\lib\site-packages\theano\compile\function_module.py", line 1428, in __init__
accept_inplace)
File "C:\Program Files\Anaconda3\lib\site-packages\theano\compile\function_module.py", line 177, in std_fgraph
update_mapping=update_mapping)
File "C:\Program Files\Anaconda3\lib\site-packages\theano\gof\fg.py", line 171, in __init__
self.__import_r__(output, reason="init")
File "C:\Program Files\Anaconda3\lib\site-packages\theano\gof\fg.py", line 360, in __import_r__
self.__import__(variable.owner, reason=reason)
File "C:\Program Files\Anaconda3\lib\site-packages\theano\gof\fg.py", line 465, in __import__
detailed_err_msg)
theano.gof.fg.MissingInputError: A variable that is an input to the graph was neither provided as an input to the function nor given a value. A chain of variables leading from this input to an output is [x, Elemwise{mul,no_inplace}.0, Elemwise{true_div,no_inplace}.0, Sum{acc_dtype=float64}.0, mean]. This chain may not be unique
Backtrace when the variable is created:
File "functions.py", line 28, in <module>
x = T.dvector('x')
我不知道从哪里又踩住我的头...谢谢
