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src/arraymancer/nn/layers/conv2D

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Types

Conv2D[T] = object
  weight*: Variable[Tensor[T]]
  bias*: Variable[Tensor[T]]
  padding*: Size2D
  stride*: Size2D
  inShape*: seq[int]
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Conv2DGate[TT] {.final.} = ref object of Gate[TT]
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Procs

proc conv2d[TT](input, weight: Variable[TT]; bias: Variable[TT] = nil;
                padding: Size2D = (0, 0); stride: Size2D = (1, 1)): Variable[TT]
Input:
- ``input`` Variable wrapping a 4D Tensor batch of images of the size [N,C_in,H_in,W_in]
- ``weight`` Variable wrapping a 4D Tensor convolving kernel weights of the size [C_out,C_in,kH,kW]
- ``bias`` Nil-able Variable wrapping a 3D Tensor bias of the size [C_out,1,1]
- ``padding`` Size2D tuple with height and width of the padding
- ``stride`` Size2D tuple with height and width of the stride

Returns:

- A variable with a convolved 4D Tensor of size [N,C_out,H_out,W_out], where
   H_out = (H_in + (2*padding.height) - kH) / stride.height + 1
   W_out = (W_in + (2*padding.width) - kW) / stride.width + 1

Future TODO: In the future the conv2D layer will allow different input layout

Warning âš :

  • Experimental, there is no tests yet for this layer
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proc forward[T](self: Conv2D[T]; input: Variable[Tensor[T]]): Variable[Tensor[T]]
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proc init[T](ctx: Context[Tensor[T]]; layerType: typedesc[Conv2D[T]];
             inShape: seq[int]; outChannels: int; kernelSize: Size2D;
             padding: Size2D = (0, 0); stride: Size2D = (1, 1)): Conv2D[T]
Creates a 2D convolutional layer. Input:
- ``inShape`` Shape of the expected input tensor in the form of ``[C_in, H_in, W_in]``
- ``outChannels`` Number of channels in the output
- ``kernelSize`` Shape of the kernel ``(width, height)``
- ``padding`` Padding, defaults to ``(0, 0)``
- ``stride`` Stride, defaults to ``(1, 1)``

Returns the created Conv2D.

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func inShape[T](self: Conv2D[T]): seq[int]
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func outShape[T](self: Conv2D[T]): seq[int]
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