code: def _pad_default(x, padding:int, mode='reflection'):
      "Pad `x` with `padding` pixels. `mode` fills in space ('zeros','reflection','border')."
      mode = _pad_mode_convert[mode]
      return F.pad(x[None], (padding,)*4, mode=mode)[0f _pad_default(x, padding:int, mode='reflection'):
      "Pad `x` with `padding` pixels. `mode` fills in space ('zeros','reflection','border')."
      mode = _pad_mode_convert[mode]
      return F.pad(x[None], (padding,)*4, mode=mode)[0]
docs: Pad `x` with `padding` pixels. `mode` fills in space ('zeros','reflection','border').