Cross-encoder: remove some unused and tidy up some comments

Signed-off-by: Mark Sturdevant <mark.sturdevant@ibm.com>

caikit_nlp/modules/text_embedding/crossencoder.py

@@ -514,19 +514,17 @@ def _truncation_needed(self, encoding, texts):
 
         # Find the last offset by counting attn masks
         # and keeping the last non-zero offset end.
-        token_count = 0
         index = 0  # index of longest
         type_id = 0  # track type_id of longest
 
         for n, attn in enumerate(attn_mask):
             if attn == 1:
-                token_count += 1
                 end = offsets[n][1]  # Index to end character from offset
                 if end > index:  # Grab last non-zero end index (ensures increasing too)
                     type_id = type_ids[n]
                     index = end
-        end_index = index  # longest
-        end_typeid = type_id  # longest
+        end_index = index  # longest last char index
+        end_typeid = type_id  # longest type (query or text)
 
         # If last token offset is before the last char, then it was truncated
         return end_index < len(texts[end_typeid].strip())
@@ -629,8 +627,8 @@ def predict(
                 if truncation_needed_indexes:
                     self.raise_truncation_error(max_len, truncation_needed_indexes)
 
-                # # We cannot send offset_mapping to the model with features,
-                # # but we needed offset_mapping for other uses.
+                # We cannot send offset_mapping to the model with features,
+                # but we needed offset_mapping for other uses.
                 if "offset_mapping" in features:
                     del features["offset_mapping"]