Fix for RuntimeError: FlashAttention only support fp16 and bf16 data type during fine tuning.

Updating positional_embedding code as suggested here - https://huggingface.co/microsoft/Phi-3-small-8k-instruct/discussions/11#6659a17e8b11da966e8e510c

positional_embedding.py

@@ -269,10 +269,10 @@ class RotaryEmbedding(torch.nn.Module):
         return (
             apply_rotary_pos_emb(
                 q, cos_cached[seqlen_offset:seq_len], sin_cached[seqlen_offset:seq_len], seq_dimension=seq_dimension
-            ),
+            ).to(q.dtype),
             apply_rotary_pos_emb(
                 k, cos_cached[seqlen_offset:seq_len], sin_cached[seqlen_offset:seq_len], seq_dimension=seq_dimension
-            ),
+            ).to(q.dtype),
         )
 
     @classmethod