local_shape_to_shape_i

[James Bergstra]

Current trunk is giving loads of errors like [1]:

Is anyone currently working on fixes to this optimization? Or is this a new issue that I should look into?

[1]

=================

ERROR (theano.gof.opt): Optimization failure due to: local_shape_to_shape_i

ERROR (theano.gof.opt): TRACEBACK:

ERROR (theano.gof.opt): Traceback (most recent call last):

  File "/home/jbergstra/cvs/PYTHONPATH/theano/gof/opt.py", line 928, in process_node

    replacements = lopt.transform(node)

  File "/home/jbergstra/cvs/PYTHONPATH/theano/tensor/opt.py", line 1097, in local_shape_to_shape_i

    return [shape_feature.make_vector_shape(node.inputs[0])]

  File "/home/jbergstra/cvs/PYTHONPATH/theano/tensor/opt.py", line 868, in make_vector_shape

    return make_vector(*self.shape_of[r])

KeyError: <montetheano.distributions.Categorical object at 0x5b72c90>.1

[Olivier Delalleau]

I don't have this error when running the test suite (rev 0c1dcab).

-=- Olivier

2012/1/24 James Bergstra <james.b...@gmail.com>

[Frédéric Bastien]

I never saw this error too.

Fred

[Arnaud Bergeron]

I think there is a clue in the key here:

KeyError: <montetheano.distributions.Categorical object at 0x5b72c90>.1

This means that James is using montetheano which might be responsible
for the problem (Note that I have no idea what it is).

--
La brigade SnW veut vous recruter - http://www.brigadesnw.ca

[James Bergstra]

Update: the bug here was caused by two things:

1. incorrect infer_shape implementations in MonteTheano

2. failure to fail properly in ShapeOptimizer

The trouble is that the ShapeOptimizer throws an exception during on_attach(), and then local_shape_to_shape_i spews out a million errors because the ShapeOptimizer couldn't initialize itself properly.

I fixed it via (1) and provided a more diagnostic error in a recent PR, but one could go further to make the ShapeOptimizer on_attach more robust.

- james