Use lower level conv interface

src/layers/conv.jl

@@ -41,7 +41,7 @@ function (c::Conv{<:Any, <:Any, <:Any, stride, pad, dilation})(x) where {stride,
   # TODO: breaks gpu broadcast :(
   # ndims(x) == ndims(c.weight)-1 && return squeezebatch(c(reshape(x, size(x)..., 1)))
   σ, b = c.σ, reshape(c.bias, map(_->1, stride)..., :, 1)
-  σ.(conv(x, c.weight, stride = stride, pad = pad, dilation = dilation) .+ b)
+  σ.(NNlib._conv{pad, stride, dilation}()(x, c.weight) .+ b)
 end
 
 function Base.show(io::IO, l::Conv)