[DDP][ez] Remove misleading comment

[rohan-varma]

Stack from ghstack:

• [wip] Move smallest bucket to end after rebuild buckets #62279
• [DDP] log bucket sizes #62232
• [DDP] Make compute_bucket_assignment_by_size return per bucket sizes #62231
• -> [DDP][ez] Remove misleading comment #62230
• [DDP] Save bucket size limits #62229
• [DDP] Log unused param names under DETAIL debug mode. #62209

We don't iterate over model replicas anymore.

Differential Revision: D29918760

[facebook-github-bot]

🔗 Helpful links

• 🧪 See artifacts and rendered test results at hud.pytorch.org/pr/62230
• 📄 Preview docs built from this PR

💊 CI failures summary and remediations

As of commit 4da89eb (more details on the Dr. CI page):

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• 2/2 failures possibly* introduced in this PR
  • 1/2 non-scanned failure(s)

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🕵️ 1 new failure recognized by patterns

The following CI failures do not appear to be due to upstream breakages:

pytorch_xla_linux_bionic_py3_6_clang9_test (1/1)

Step: "Run tests" (full log | diagnosis details | 🔁 rerun)

Jul 28 03:18:38 2021-07-28 03:18:38.300366: E t...w/compiler/xla/service/slow_operation_alarm.cc:55]

Jul 28 03:01:36   test_AvgPool3d_backward_after_cat_dim1_device_xla (__main__.TestNNDeviceTypeXLA) ... skip (0.002s)
Jul 28 03:01:36   test_BatchNorm_empty_xla (__main__.TestNNDeviceTypeXLA) ... ok (0.139s)
Jul 28 03:01:36   test_Bilinear_empty_xla (__main__.TestNNDeviceTypeXLA) ... skip (0.002s)
Jul 28 03:01:36   test_CTCLoss_cudnn_xla (__main__.TestNNDeviceTypeXLA) ... skip (0.008s)
Jul 28 03:01:37   test_CTCLoss_empty_target_xla (__main__.TestNNDeviceTypeXLA) ... ok (0.876s)
Jul 28 03:03:48   test_Conv2d_backward_depthwise_xla_float64 (__main__.TestNNDeviceTypeXLA) ... 2021-07-28 03:03:48.734391: E tensorflow/compiler/xla/service/slow_operation_alarm.cc:55] 
Jul 28 03:03:48 ********************************
Jul 28 03:03:48 Very slow compile?  If you want to file a bug, run with envvar XLA_FLAGS=--xla_dump_to=/tmp/foo and attach the results.
Jul 28 03:03:48 Compiling module SyncTensorsGraph.30789
Jul 28 03:03:48 ********************************
Jul 28 03:18:38 2021-07-28 03:18:38.300366: E tensorflow/compiler/xla/service/slow_operation_alarm.cc:55] 
Jul 28 03:18:38 ********************************
Jul 28 03:18:38 Very slow compile?  If you want to file a bug, run with envvar XLA_FLAGS=--xla_dump_to=/tmp/foo and attach the results.
Jul 28 03:18:38 Compiling module SyncTensorsGraph.35441
Jul 28 03:18:38 ********************************


Too long with no output (exceeded 1h30m0s): context deadline exceeded

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1 job timed out:

• pytorch_xla_linux_bionic_py3_6_clang9_test

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ci.pytorch.org: 1 failed

• Failed: pr/pytorch-linux-bionic-rocm4.2-py3.6

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This pull request has been merged in c76daa6.