Explanation of output of Python tqdm.

Question

I have a program in python that uses tqdm to output progress bar which shows like below:

  0%|          |   1/782 [00:02<31:00,  2.38s/it, loss=0.763 ]
 17%|█▋        | 134/782 [00:19<01:21,  7.98it/s, loss=0.375 ]
100%|██████████| 782/782 [03:50<00:00,  2.73it/s, loss=0.0193]
100%|█████████▉| 779/782 [03:47<00:00,  4.33it/s, loss=0.0175]
100%|█████████▉| 780/782 [03:48<00:00,  4.08it/s, loss=0.0172]
100%|█████████▉| 781/782 [03:48<00:00,  3.83it/s, loss=0.0195]

Lets take 2nd row:

 17%|█▋        | 134/782 [00:19<01:21,  7.98it/s, loss=0.375 ]

The fields in order are:

• 17%: Percentage complete.
• |█▋ | : Progress bar
• 134/782: Number of items iterated over total number of items.
• [00:19<01:21, 7.98it/s, loss=0.375 ]: Lets break this down below separately.
  • 00:19<01:21 : <<HERE>> Cant' figure this out.
  • 7.98it/s: iterations per second
  • loss=0.375: As the label says, it is the loss.

I understand that it is showing progress and stats like, iterations per second, loss obtained etc. However I am not able to precisely say what this time format ( 00:19<01:21 for example ) represents in every row? What does the < sign indicate?

Answer 1

In the source code [1] there is a comment about it in format_meter method, it refers to {elapsed}<{remaining}

[1] https://github.com/tqdm/tqdm/blob/master/tqdm/std.py#L397

Answer 2

The value 00:19 in 00:19<01:21, 7.98it/s is the elapsed time, while the value 1:21 is the remaining time, acording to the iterations per second value. Hence, it is not a static value.