Method checkpoint

pogom/utils.py:410–412

(self, step)

        self.times.append((step, t, round((t - self.times[-1][1]) * 1000)))

    def checkpoint(self, step):
        t = time.time()
        self.times.append(('total @ ' + step, t, t - self.times[0][1]))

    def output(self):
        self.checkpoint('end')