conv2d
fun DagBuilder.conv2d(input: GraphValue<*>, weight: GraphValue<*>, bias: GraphValue<*>, stride: Pair<Int, Int> = 1 to 1, padding: Pair<Int, Int> = 0 to 0, dilation: Pair<Int, Int> = 1 to 1, groups: Int = 1, id: String = ""): GraphValue<*>
DSL extension for conv2d.