Cleaning up nvFuser's repro script api. (#1231)

thunder/examine/__init__.py

@@ -263,7 +263,11 @@ def get_nvfuser_repro(trace: TraceCtx, fusion_name: str, /) -> str:
         )
 
     fd = fusion.last_used
-    get_repro = getattr(fd, "getReproString", None)
+    # The API for nvFuser version >=2.14
+    get_repro = getattr(fd, "repro_script_for", None)
+    # The legacy nvFuser API
+    if get_repro is None:
+        get_repro = getattr(fd, "getReproString", None)
     if get_repro is None:
         raise RuntimeError("The installed version of nvFuser does not support repro generation unless on crash.")
 

thunder/tests/test_nvfuser.py

@@ -1050,8 +1050,16 @@ def sdpa_fn(q, k, v, dropout_p, is_causal, scale):
 
     # Check nv_sdpfa_fwd is not in bwd_fusion -> that would indicate rematerialization
     assert "nv_sdpfa_bwd" in bwd_fusion[-1][-1].name and "nv_sdpfa_fwd" not in bwd_fusion[-1][-1].name
+
+    nvf_fd = bwd_fusion[-1][-1].last_used
+    repro_script = None
+    # Legacy repro script API
+    if nvfuser_version() < LooseVersion("0.2.14"):
+        repro_script = nvf_fd.getReproString()
+    else:
+        repro_script = nvf_fd.repro_script_for()
     assert (
-        bwd_fusion[-1][-1].last_used.getReproString().count("is_cpu=True") == 2
+        repro_script.count("is_cpu=True") == 2
     ), "Expected philox_seed and philox_offset inputs to be CPU scalar tensors."
 
     # Torch reference computation