[mlpack-git] [mlpack/mlpack] fixes: convolve with correct weight slice, pad input in forward pass (#737)

[Marcus Edel]

> @@ -126,7 +132,11 @@ class ConvLayer
>          BackwardConvolutionRule::Convolution(gy.slice(inMap), rotatedFilter,
>              output);
>  
> -        g.slice(outMap) += output;
> +        if (wPad != 0 || hPad != 0)

The gradient isn't set if ``(wPad != 0 || hPad != 0)`` isn't true. In case ``(wPad != 0 || hPad != 0)``is false the gradient is the output value.

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