Re: [theano-users] which function in theano implement numpy.where?
Thank you Mr. Lamblin, you reply is helpful :)
On Wednesday, November 23, 2016 at 8:02:10 AM UTC+8, Pascal Lamblin wrote:
>
> Hi,
>
> The only syntax we currently support in tensor.where is the one where
> two additional argument are provided, like in:
>
> >>> numpy.where(a > 3, a, a + 3)
> array([3, 4, 5, 6, 4, 5, 6, 7, 8, 9])
>
> >>> x = tensor.vector()
> >>> tensor.where(x > 3, x, x + 3).eval({x: a})
> array([ 3., 4., 5., 6., 4., 5., 6., 7., 8., 9.])
>
>
> If you want to reproduce the behaviour when only the condition is
> provided, you can do that with nonzero:
> >>> out, = tensor.nonzero(x > 3)
> >>> out.eval({x: a})
> array([4, 5, 6, 7, 8, 9])
>
> Note that Theano will return a tuple of 1 array if x.ndim == 1, whereas
> numpy returns a single array.
>
> If you are interested in making the "nonzero" feature available from
> "tensor.where", please let us know.
>
> On Tue, Nov 22, 2016, linzhe...@gmail.com wrote:
> > Dear all,
> > I wanna to use np.where in theano. However, it seems that
> > theano.tensor.where is not doing the same things as numpy.where will do.
> Is
> > there any function i can use in theano?
> > For example,
> >
> > a = numpy.arange(10)
> > index = numpy.where(a>a[0])
> >
> > How to implement the code above in theano?
> >
> > --
> >
> > ---
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>
>
> --
> Pascal
>
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Re: [theano-users] which function in theano implement numpy.where?
Hi,
The only syntax we currently support in tensor.where is the one where
two additional argument are provided, like in:
>>> numpy.where(a > 3, a, a + 3)
array([3, 4, 5, 6, 4, 5, 6, 7, 8, 9])
>>> x = tensor.vector()
>>> tensor.where(x > 3, x, x + 3).eval({x: a})
array([ 3., 4., 5., 6., 4., 5., 6., 7., 8., 9.])
If you want to reproduce the behaviour when only the condition is
provided, you can do that with nonzero:
>>> out, = tensor.nonzero(x > 3)
>>> out.eval({x: a})
array([4, 5, 6, 7, 8, 9])
Note that Theano will return a tuple of 1 array if x.ndim == 1, whereas
numpy returns a single array.
If you are interested in making the "nonzero" feature available from
"tensor.where", please let us know.
On Tue, Nov 22, 2016, linzhesha...@gmail.com wrote:
> Dear all,
> I wanna to use np.where in theano. However, it seems that
> theano.tensor.where is not doing the same things as numpy.where will do. Is
> there any function i can use in theano?
> For example,
>
> a = numpy.arange(10)
> index = numpy.where(a>a[0])
>
> How to implement the code above in theano?
>
> --
>
> ---
> You received this message because you are subscribed to the Google Groups
> "theano-users" group.
> To unsubscribe from this group and stop receiving emails from it, send an
> email to theano-users+unsubscr...@googlegroups.com.
> For more options, visit https://groups.google.com/d/optout.
--
Pascal
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[theano-users] which function in theano implement numpy.where?
Dear all, I wanna to use np.where in theano. However, it seems that theano.tensor.where is not doing the same things as numpy.where will do. Is there any function i can use in theano? For example, a = numpy.arange(10) index = numpy.where(a>a[0]) How to implement the code above in theano? -- --- You received this message because you are subscribed to the Google Groups "theano-users" group. To unsubscribe from this group and stop receiving emails from it, send an email to theano-users+unsubscr...@googlegroups.com. For more options, visit https://groups.google.com/d/optout.
