code: function(opt) {
      var opt = opt || {};
  
      // computed
      this.out_sx = opt.in_sx;
      this.out_sy = opt.in_sy;
      this.out_depth = opt.in_depth;
      this.layer_type = 'relu';
    }
docs: Implements ReLU nonlinearity elementwise x -> max(0, x) the output is in [0, inf)