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stats object counting time wrong

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Summary: On each call of the stats.update the object calculates current average iteration time by getting time elapsed from the time_start and then dividing it by the current number of steps. It saves the result to AverageMeter object which when queried returns the average of things saved, so the time is averaged twice which biases it towards the start value (which is often larger).

Reviewed By: kjchalup

Differential Revision: D39206989

fbshipit-source-id: ccab5233d7aaca1ac4fd626fb329b83c7c0d6af9
This commit is contained in:
Darijan Gudelj 2022-09-05 06:27:37 -07:00 committed by Facebook GitHub Bot
parent 72c3a0ebe5
commit dd58ded73d
1 changed files with 5 additions and 4 deletions
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pytorch3d/implicitron/tools/stats.py
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@ -118,6 +118,7 @@ class Stats(object):
self.plot_file = plot_file
self.do_plot = do_plot
self.hard_reset(epoch=epoch)
self._t_last_update = None
@staticmethod
def from_json_str(json_str):
@ -215,7 +216,6 @@ class Stats(object):
self.it[stat_set] += 1
epoch = self.epoch
it = self.it[stat_set]
for stat in self.log_vars:
@ -224,10 +224,11 @@ class Stats(object):
if stat == "sec/it": # compute speed
if time_start is None:
elapsed = 0.0
time_per_it = 0.0
else:
elapsed = time.time() - time_start
time_per_it = float(elapsed) / float(it + 1)
now = time.time()
time_per_it = now - (self._t_last_update or time_start)
self._t_last_update = now
val = time_per_it
else:
if stat in preds: