Hi,
I'm getting an error when trying to get the gradient of a function.
Basically, I want to use two parameters to define the lower and upper bound
of an iterator.
For easier understanding I simplified my code:
from theano import theano, tensor as tt
def get_sum(param1, param2):
seq = tt.arange(param1, param2)
components, _ = theano.scan(lambda index: index**2,
outputs_info=None,
sequences=[seq])
return tt.sum(components)
param1 = tt.dscalar('param1')
param1.tag.test_value = 0.0
param2 = tt.dscalar('param2')
param2.tag.test_value = 10.0
objective = get_sum(param1, param2)
obj_function = theano.function(inputs=[param1, param2],outputs=objective)
obj_gradient = theano.gradient.jacobian(objective,[param1])
gradient_function = theano.function(inputs=[param1, param2],
outputs=obj_gradient)
---------------------------------------------------------------------------
...
TypeError: ARange{dtype='int64'}.grad illegally returned an integer-valued
variable. (Input index 0, dtype int64)
The function that is called in theano.scan (which is index**2 in the
example) could be any function that uses the index as one of its parameters.
What do I need to change about the code to make it work?
The same error occurs when using theano version 0.8.2 or
0.9.0.dev-b3d19ce8e8d7cdf87c3f84599be81647803aa1f6
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