Make single-file dblock MoE self-contained

agillm4_dblock_single_file.py

@@ -3120,7 +3120,7 @@ def _train_phase(
             break
         if _profile_batch:
             try:
-                import dblocks_train as _db_prof
+                _db_prof = sys.modules.get(__name__)
                 _db_prof._profile_add(_DBS, "data_stream", time.perf_counter() - _data_t)
             except Exception:
                 pass
@@ -3138,7 +3138,7 @@ def _train_phase(
                 except Exception:
                     pass
             try:
-                import dblocks_train as _db_prof
+                _db_prof = sys.modules.get(__name__)
                 _db_prof._profile_add(_DBS, "tensor", time.perf_counter() - _tensor_t)
             except Exception:
                 pass