python - Obscure Looping Error in Theano -

python - Obscure Looping Error in Theano -

i trying simulate repeat-until loop in theano:

def method_a(arguments): ... homecoming result, theano.scan.until(t.eq(a,b))

i encountered next unusual behaviour. allow b constant. whenever a constant, works fine. however, when a scalar, error related optimisation:

error (theano.gof.opt): seqoptimizer apply <theano.gof.opt.equilibriumoptimizer object @ 0x110d0d8d0> error (theano.gof.opt): traceback: error (theano.gof.opt): traceback (most recent phone call last): file "[...]/lib/python2.7/site-packages/theano/gof/opt.py", line 196, in apply sub_prof = optimizer.optimize(fgraph) file "[...]/python2.7/site-packages/theano/gof/opt.py", line 82, in optimize ret = self.apply(fgraph, *args, **kwargs) file "[...]/python2.7/site-packages/theano/gof/opt.py", line 1665, in apply gopt.apply(fgraph) file "[...]/python2.7/site-packages/theano/scan_module/scan_opt.py", line 1300, in apply if self.belongs_to_set(nd, subset): file "[...]/python2.7/site-packages/theano/scan_module/scan_opt.py", line 1286, in belongs_to_set rep.op.inputs) file "[...]/python2.7/site-packages/theano/scan_module/scan_utils.py", line 452, in equal_computations dx.type.dtype == dy.type.dtype , attributeerror: 'nonetypet' object has no attribute 'dtype'

i'd appreciate if help me understand error. i'm assuming attributeerror doesn't refer a or b, because can print dtype , see have one. other that, can't create sense out of it.

[edit] not fatal error. code runs , process finishes exit code 0. looks theano trying optimise graph , fails so, doesn't impact program.

the traceback indicate in function equal_compuations(), didn't cover case, when doing comparison.

i have pr prepare here:

https://github.com/theano/theano/pull/1928

thanks report.

your [edit] section, indicate me cutting of errors message. if happear during optimization warning, mean optimization skipped. possible optimization don't apply, possible fix, optimization apply. if case, there speed fix.

python theano