adding todos

tests/models/layers/test_flash_attn.py

@@ -167,7 +167,7 @@ def test_seq_id_masking_FA_v2(attn_impl: str):
         pytest.skip(
             'FlexAttention is not supported in torch version {torch.__version__}<2.5.1.',
         )
-    d = 128  # Compiled FlexAttention works for d=16 with seqlen=6, but not for d=128 with seqlen=6. For seqlen=128, all d's in [16, 32, 64, 128, 256] work. Probably because this is not yet fixed: https://pytorch.org/blog/flexattention/#limitations-and-future-work
+    d = 128  # TODO: Compiled FlexAttention works for d=16 with seqlen=6, but not for d=128 with seqlen=6. For seqlen=128, all d's in [16, 32, 64, 128, 256] work. Probably because this is not yet fixed: https://pytorch.org/blog/flexattention/#limitations-and-future-work
     n_heads = 4
     kv_n_heads = 4
     seqlen_1 = 128
@@ -311,7 +311,7 @@ def test_alibi_bias(attn_impl: str, n_heads: int):
     dtype = torch.bfloat16
     device = 'cuda'
     d = 128
-    seqlen_1 = 6 if attn_impl != 'flex' else 128  # FlexAttention requires seqlen to be a multiple of 128 (to compute gradients I think). More info: https://pytorch.org/blog/flexattention/#limitations-and-future-work
+    seqlen_1 = 6 if attn_impl != 'flex' else 128  # TODO: FlexAttention requires seqlen to be a multiple of 128 (to compute gradients I think). More info: https://pytorch.org/blog/flexattention/#limitations-and-future-work
     bsz = 2
 
     query_1 = torch.randn(bsz, seqlen_1,