compareFilters.js

export function compareFilters(filterDeltas, inputs, deltas) {
  const startingInputY = this.thread.y - this.constants.paddingY
  const startingInputX = this.thread.x - this.constants.paddingX

  let deltaSlideY = 0

  let sum = filterDeltas[this.thread.z][this.thread.y][this.thread.x]
  for (let y = 0; y < this.constants.slideHeight; y++) {
    deltaSlideY++
    let deltaSlideX = 0

    const inputY = startingInputY + (y * this.constants.strideY)
    if (inputY < 0 || inputY >= this.constants.inputHeight) continue

    for (let x = 0; x < this.constants.slideWidth; x++) {
      deltaSlideX++

      const inputX = startingInputX + (x * this.constants.strideX)
      if (inputX < 0 || inputX >= this.constants.inputWidth) continue

      const input = inputs[this.thread.z][inputY][inputX]
      const deltaY = deltaSlideY - 1;
      const deltaX = deltaSlideX - 1;
      sum += input * deltas[this.constants.deltaZ][deltaY][deltaX]
    }
  }

  return sum
}