On Mon, Nov 10, 2014 at 10:54 AM, Amir Farbin <[email protected]> wrote:
> Hi,
>
>
> I'm trying to convert expressions sympy to theano... following:
>
>
> http://matthewrocklin.com/blog/work/2013/03/28/SymPy-Theano-part-2/
>
>
> And I run into a failure that appears simple to fix. Here's a simple
> example:
>
>
> from sympy.printing.theanocode import theano_function
>
>
> im=sp.sqrt(-1)
Note that you can use "I", i.e. sp.I.
>
> x=sp.symbols("x")
>
> y=x+im*x
>
> fn_theano = theano_function([x], [y], dims={x: 1}, dtypes={x: 'float64'})
>
>
> ends with:
>
>
> KeyError: <class 'sympy.core.numbers.ImaginaryUnit'>
>
>
> which appears to my naive eyes to be a just a missing entry in a conversion
> map. Can someone help?
There seem to be more bugs. With the latest master, I am getting:
In [1]: from sympy.printing.theanocode import theano_function
In [3]: import sympy as sp
In [4]: im=sp.sqrt(-1)
In [5]: x=sp.symbols("x")
In [6]: y=x+im*x
In [7]: fn_theano = theano_function([x], [y], dims={x: 1}, dtypes={x:
'float64'})
---------------------------------------------------------------------------
NameError Traceback (most recent call last)
<ipython-input-7-8d3dbb9c015b> in <module>()
----> 1 fn_theano = theano_function([x], [y], dims={x: 1}, dtypes={x:
'float64'})
/home/certik/repos/sympy/sympy/printing/theanocode.py in
theano_function(inputs, outputs, dtypes, cache, **kwargs)
224 code = partial(theano_code, cache=cache, dtypes=dtypes,
225 broadcastables=broadcastables)
--> 226 tinputs = list(map(code, inputs))
227 toutputs = list(map(code, outputs))
228 toutputs = toutputs[0] if len(toutputs) == 1 else toutputs
/home/certik/repos/sympy/sympy/printing/theanocode.py in
theano_code(expr, cache, **kwargs)
192
193 def theano_code(expr, cache=global_cache, **kwargs):
--> 194 return TheanoPrinter(cache=cache,
settings={}).doprint(expr, **kwargs)
195
196
/home/certik/repos/sympy/sympy/printing/theanocode.py in doprint(self,
expr, **kwargs)
187 def doprint(self, expr, **kwargs):
188 """Returns printer's representation for expr (as a string)"""
--> 189 return self._print(expr, **kwargs)
190
191 global_cache = {}
/home/certik/repos/sympy/sympy/printing/printer.pyc in _print(self,
expr, *args, **kwargs)
255 printmethod = '_print_' + cls.__name__
256 if hasattr(self, printmethod):
--> 257 return getattr(self, printmethod)(expr,
*args, **kwargs)
258
259 # Unknown object, fall back to the emptyPrinter.
/home/certik/repos/sympy/sympy/printing/theanocode.py in
_print_Symbol(self, s, dtypes, broadcastables)
78 return self.cache[key]
79 else:
---> 80 value = tt.tensor(name=s.name, dtype=dtype,
broadcastable=broadcastable)
81 self.cache[key] = value
82 return value
NameError: global name 'tt' is not defined
Thanks for letting us know. This might be quite easy to fix, just go
into the source file, do the fix and test it. We can help you out. If
you fix it, then just send us a pull request.
Ondrej
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