code: public SDVariable relu(String name, SDVariable x, double cutoff) {
          validateFloatingPoint("ReLU", x);
          SDVariable result = f().relu(x, cutoff);
          return updateVariableNameAndReference(result, name);
      }
docs: Element-wise rectified linear function with specified cutoff:<br>
  out[i] = in[i] if in[i] >= cutoff
  out[i] = 0 otherwise
  
  @param name   Output variable name
  @param x      Input variable
  @param cutoff Cutoff value. Usually 0
  @return Output variable