Any idea why this code is not working?
import theano
from theano import tensor
from theano import shared
from theano import function
import numpy as np
x=tensor.ivector('x')
def step(u_t):
h=u_t*1
return h
[h], _ = theano.scan(step , sequences=[x])
f=function([x],[h])
b=[1,2,3,4,5,6]
print(f(b))
*Error is: *
Traceback (most recent call last):
File "Test1.py", line 31, in <module>
[h], _ = theano.scan(step , sequences=x)
File "/usr/local/lib/python2.7/dist-packages/theano/tensor/var.py", line
596, in __iter__
for i in xrange(theano.tensor.basic.get_vector_length(self)):
File "/usr/local/lib/python2.7/dist-packages/theano/tensor/basic.py",
line 4685, in get_vector_length
raise ValueError("length not known: %s" % msg)
ValueError: length not known: for{cpu,scan_fn} [id A] ''
|Subtensor{int64} [id B] ''
| |Shape [id C] ''
| | |Subtensor{int64::} [id D] 'x[0:]'
| | |x [id E]
| | |Constant{0} [id F]
| |Constant{0} [id G]
|Subtensor{:int64:} [id H] ''
| |Subtensor{int64::} [id D] 'x[0:]'
| |ScalarFromTensor [id I] ''
| |Subtensor{int64} [id B] ''
|Subtensor{int64} [id B] ''
Inner graphs of the scan ops:
for{cpu,scan_fn} [id A] ''
>Elemwise{mul,no_inplace} [id J] ''
> |x[t] [id K] -> [id H]
> |TensorConstant{1} [id L]
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