AutoTP Assert Kernel Injection Support (#2939)

* check kernel injection supported models

* Clarify why user should use kernel injection

deepspeed/module_inject/auto_tp.py

@@ -4,6 +4,7 @@
 import re
 
 from torch import nn
+from .replace_policy import replace_policies
 
 
 class AutoTP():
@@ -73,15 +74,30 @@ class AutoTP():
         policy_list.append(tuple([type(new_module), new_gems]))
         return policy_list
 
+    def kernel_supported(module_list):
+        policy = []
+        for plcy in replace_policies:
+            # instantiate a throw-away policy in order to populate the _orig_layer_class
+            _ = plcy(None)
+            if isinstance(plcy._orig_layer_class, list):
+                for orig_layer_class in plcy._orig_layer_class:
+                    policy.append(orig_layer_class)
+            elif plcy._orig_layer_class is not None:
+                policy.append(plcy._orig_layer_class)
+        for child in module_list:
+            if child.__class__ in policy:
+                return True
+        return False
+
     def tp_parser(model):
         policy_list = []
         module_list = []
         layer_list = []
         gem_list = []
 
-        assert AutoTP.supported(model), "Automatic policy not supported for model. Please provide policy."
-
         module_list = AutoTP.get_module_list(model)
+        assert AutoTP.supported(model), "AutoTP not supported for model. Please use kernel injection since container policy for model exists." \
+        if AutoTP.kernel_supported(module_list) else "AutoTP not supported for model. Please provide policy."
         for module in module_list:
             for key, submodule in module._modules.items():
                 if isinstance(submodule, nn.Linear):
@@ -103,5 +119,6 @@ class AutoTP():
                 gem_list = list(set(gem_list))
                 policy_list = AutoTP.update_policy_list(policy_list, module, gem_list)
                 gem_list = []
-        assert len(policy_list), "Not able to determine model policy automatically. Please provide policy."
+        assert len(policy_list), "AutoTP not supported for model. Please use kernel injection since container policy for model exists." \
+        if AutoTP.kernel_supported(module_list) else "Not able to determine model policy automatically. Please provide policy."
         return policy_list