chore: bump Megatron-LM submodule to mcore main b4ad280d

svcnemo-autobot · svcnemo-autobot · commit eb9f6600cd99 · 2026-07-18T12:14:55.000Z
Bump 3rdparty/Megatron-LM to the tip of Megatron-LM main and record it in
.main.commit. uv.lock refresh follows in a separate commit.

Signed-off-by: svcnemo-autobot &lt;svcnemo-autobot@nvidia.com&gt;
diff --git a/.main.commit b/.main.commit
@@ -1 +1 @@
-61f31145dfb4cfaa7d285df12aa9abffb22ff485
+b4ad280d352e7d3d57040f60a16f358da1a75893
diff --git a/3rdparty/Megatron-LM b/3rdparty/Megatron-LM
@@ -1 +1 @@
-Subproject commit 61f31145dfb4cfaa7d285df12aa9abffb22ff485
+Subproject commit b4ad280d352e7d3d57040f60a16f358da1a75893

Original file line number	Diff line number	Diff line change
`@@ -1 +1 @@`
`1`		`-61f31145dfb4cfaa7d285df12aa9abffb22ff485`
	`1`	`+b4ad280d352e7d3d57040f60a16f358da1a75893`