After running some tests, it seems like:
- Use `add` where the input can be an arbitrarily long list of variables,
and we want to add them like x+y+z+...
- Use `sum` when we have some matrix/vector and we want to sum its
components.
On Monday, April 24, 2017 at 9:14:07 AM UTC-7, Daniel Seita wrote:
>
> Hmmm ... upon reading the same docs page linked above, I see the following:
>
> __{abs,neg,lt,le,gt,ge,invert,and,or,add,sub,mul,div,truediv,floordiv}__
>
> Those elemwise operation are supported via Python syntax.
>
> That must be where `T.add` comes from. I'll still need to investigate on
> the difference between `T.add` and `T.sum` but maybe this will help...
>
> On Monday, April 24, 2017 at 9:09:38 AM UTC-7, Daniel Seita wrote:
>>
>> Hi all,
>>
>> I am reading through some theano code written by someone else (the
>> actual file is here
>> <https://github.com/joschu/modular_rl/blob/d1aeb866f4293d4458de1bc02a42e380289e9c43/modular_rl/core.py>
>>
>> if you're curious but it shouldn't matter for this question).
>>
>> I've noticed that the code uses two functions from theano: `add` and
>> `sum`.
>>
>> I found the theano.tensor.sum docs linked here
>> <http://deeplearning.net/software/theano/library/tensor/basic.html?highlight=theano%20tensor%20sum#theano.tensor.sum>.
>>
>> However, I surprisingly can't find any documentation for the `add` method
>> (or even any existing questions here or on stack overflow). I know it seems
>> obvious that the add method just sums up its arguments, but I just want to
>> be extra sure. I'm also curious about if there's an alias, i.e. if
>> `T.add(x,y)` is the same as `x+y` where `x` and `y` are theano variables.
>> Finally, I'd also be curious about the differences between `add` and `sum`
>> in theano.
>>
>> Thanks.
>>
>
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