[theano-users] Meaning of this error message

[Sym]

I don't understand the following error message, any help would be
appreciated !!
















*ERROR (theano.gof.opt): Optimization failure due to: constant_foldingERROR
(theano.gof.opt): node: Assert{msg='Theano Assert
failed!'}(TensorConstant{0.0}, TensorConstant{False})ERROR
(theano.gof.opt): TRACEBACK:ERROR (theano.gof.opt): Traceback (most recent
call last): File
"/Users/mcomin/anaconda/lib/python3.5/site-packages/theano/gof/opt.py",
line 1982, in process_node replacements = lopt.transform(node) File
"/Users/mcomin/anaconda/lib/python3.5/site-packages/theano/tensor/opt.py",
line 6452, in constant_folding required = thunk() File
"/Users/mcomin/anaconda/lib/python3.5/site-packages/theano/gof/op.py", line
843, in rval fill_storage() File
"/Users/mcomin/anaconda/lib/python3.5/site-packages/theano/gof/cc.py", line
1698, in __call__ reraise(exc_type, exc_value, exc_trace) File
"/Users/mcomin/anaconda/lib/python3.5/site-packages/six.py", line 686, in
reraise raise valueAssertionError: Theano Assert failed!*

Traceback (most recent call last):

[... I removed the traceback for brevity... ]

*AssertionError: ('The following error happened while compiling the node',
forall_inplace,cpu,scan_fn}(TensorConstant{2}, TensorConstant{[0 1]},
IncSubtensor{InplaceSet;:int64:}.0, IncSubtensor{InplaceSet;:int64:}.0,
IncSubtensor{InplaceSet;:int64:}.0, W, gamma, beta, W, b, W, b, W, b, W, b,
W, b, W, b, W, b, W, b, W, b, noise, InplaceDimShuffle{x,0,x}.0,
InplaceDimShuffle{0,1,x,2}.0, InplaceDimShuffle{x,0,x}.0,
InplaceDimShuffle{0,1,x,2}.0, InplaceDimShuffle{x,0,x}.0,
InplaceDimShuffle{0,1,x,2}.0, InplaceDimShuffle{x,0,x}.0,
InplaceDimShuffle{0,1,x,2}.0, InplaceDimShuffle{x,0,x}.0,
InplaceDimShuffle{0,1,x,2}.0, InplaceDimShuffle{x,0,x}.0,
InplaceDimShuffle{0,1,x,2}.0, InplaceDimShuffle{x,0,x}.0,
InplaceDimShuffle{0,1,x,2}.0, InplaceDimShuffle{x,0,x}.0,
InplaceDimShuffle{0,1,x,2}.0, InplaceDimShuffle{x,0,x}.0,
InplaceDimShuffle{0,1,x,2}.0, InplaceDimShuffle{x,0,x}.0,
InplaceDimShuffle{x,0,x}.0, Subtensor{::, ::, int64}.0, mean,
Elemwise{mul,no_inplace}.0, Elemwise{inv,no_inplace}.0,
Elemwise{mul,no_inplace}.0), '\n', 'The following error happened while
compiling the node', forall_inplace,cpu,scan_fn}(TensorConstant{2},
Elemwise{Composite{OR(EQ(i0, i1), EQ(i0, i1))}}.0, TensorConstant{[0 1]},
IncSubtensor{InplaceSet;:int64:}.0, IncSubtensor{InplaceSet;:int64:}.0,
IncSubtensor{InplaceSet;:int64:}.0, ScalarFromTensor.0,
InplaceDimShuffle{x,0,x}.0, InplaceDimShuffle{0,1,x,2}.0,
InplaceDimShuffle{x,0,x}.0, InplaceDimShuffle{0,1,x,2}.0,
InplaceDimShuffle{x,0,x}.0, InplaceDimShuffle{0,1,x,2}.0,
InplaceDimShuffle{x,0,x}.0, InplaceDimShuffle{0,1,x,2}.0,
InplaceDimShuffle{x,0,x}.0, InplaceDimShuffle{0,1,x,2}.0,
InplaceDimShuffle{x,0,x}.0, InplaceDimShuffle{0,1,x,2}.0,
InplaceDimShuffle{x,0,x}.0, InplaceDimShuffle{0,1,x,2}.0,
InplaceDimShuffle{x,0,x}.0, InplaceDimShuffle{0,1,x,2}.0,
InplaceDimShuffle{x,0,x}.0, InplaceDimShuffle{0,1,x,2}.0,
InplaceDimShuffle{x,0,x}.0, InplaceDimShuffle{x,0,x}.0, Subtensor{::, ::,
int64}.0, Elemwise{mul,no_inplace}.0, Elemwise{Mul}[(0, 1)].0,
Elemwise{Composite{inv(sqrt((i0 + (i1 * i2))))}}[(0, 2)].0,
Elemwise{mul,no_inplace}.0), '\n', 'Theano Assert failed!')*



Thanks !