From 817c49e225838af4fec495b2447d74fbb8e2805a Mon Sep 17 00:00:00 2001
From: Mr-Neutr0n <64578610+Mr-Neutr0n@users.noreply.github.com>
Date: Sun, 15 Feb 2026 20:55:58 +0530
Subject: [PATCH] fix tqdm progress bar using refresh() instead of update()

The _update_n helper was directly setting bar.n and calling
bar.refresh(), which bypasses tqdm's update() logic. This meant
EMA-based rate estimation and dynamic miniters were never updated,
breaking things like custom smoothing values.

Switched to bar.update(value - bar.n) so that tqdm's internal
bookkeeping runs properly.

Fixes #21320
---
 src/lightning/pytorch/callbacks/progress/tqdm_progress.py | 3 +--
 1 file changed, 1 insertion(+), 2 deletions(-)

diff --git a/src/lightning/pytorch/callbacks/progress/tqdm_progress.py b/src/lightning/pytorch/callbacks/progress/tqdm_progress.py
index 74abb8ecd850c..2030c207a0489 100644
--- a/src/lightning/pytorch/callbacks/progress/tqdm_progress.py
+++ b/src/lightning/pytorch/callbacks/progress/tqdm_progress.py
@@ -463,5 +463,4 @@ def convert_inf(x: Optional[Union[int, float]]) -> Optional[Union[int, float]]:
 
 def _update_n(bar: _tqdm, value: int) -> None:
     if not bar.disable:
-        bar.n = value
-        bar.refresh()
+        bar.update(value - bar.n)