Fix auto TP for duplicate modules with different gems (#2784)

* Fix auto TP for duplicate modules with different gems

* precommit and comments

* Comment

* Combine gem list of same named modules

* remove duplicates from gem_list before updating policy

* Add module attribute with name variation for ProphetNet

---------
Co-authored-by: NJeff Rasley <jerasley@microsoft.com>

deepspeed/module_inject/auto_tp.py

@@ -41,12 +41,24 @@ class AutoTP():
         for key, submodule in module._modules.items():
             if isinstance(submodule, nn.Linear):
                 layer_list = layer_list + [parent + "." + key]
-            elif isinstance(submodule, nn.LayerNorm) or key == 'LayerNorm':
+            elif isinstance(submodule,
+                            nn.LayerNorm) or key == 'LayerNorm' or key == 'layer_norm':
                 layer_list = layer_list + ["ln"]
             else:
                 layer_list = layer_list + AutoTP.get_layers(key, submodule)
         return layer_list
 
+    def update_policy_list(policy_list, new_module, new_gems):
+        if len(policy_list):
+            for i, policy in enumerate(policy_list):
+                # if module already exists in policy, combine gems and remove duplicates
+                if policy[0] == type(new_module):
+                    new_gems = set(new_gems + policy[1])
+                    policy_list[i] = tuple([type(new_module), new_gems])
+                    return policy_list
+        policy_list.append(tuple([type(new_module), new_gems]))
+        return policy_list
+
     def tp_parser(model):
         policy_list = []
         module_list = []
@@ -60,7 +72,9 @@ class AutoTP():
             for key, submodule in module._modules.items():
                 if isinstance(submodule, nn.Linear):
                     layer_list = layer_list + ["." + key]
-                elif isinstance(submodule, nn.LayerNorm) or key == 'LayerNorm':
+                elif isinstance(
+                        submodule,
+                        nn.LayerNorm) or key == 'LayerNorm' or key == 'layer_norm':
                     layer_list = layer_list + ["ln"]
                 else:
                     layer_list = layer_list + AutoTP.get_layers(key, submodule)
@@ -70,7 +84,9 @@ class AutoTP():
                         gem_list = gem_list + [layer_list[i - 1]]
                 elif 'out_proj' in layer:
                     gem_list = gem_list + [layer]
+            layer_list = []
             if gem_list != []:
-                policy_list.append(tuple([type(module), gem_list]))
+                gem_list = list(set(gem_list))
+                policy_list = AutoTP.update_policy_list(policy_list, module, gem_list)
                 gem_list = []
         return policy_list

deepspeed/module_inject/replace_module.py

@@ -463,6 +463,8 @@ def replace_transformer_layer(orig_layer_impl,
                 child.num_heads = child.num_heads // mp_size
             if hasattr(child, 'num_attention_heads'):
                 child.num_attention_heads = child.num_attention_heads // mp_size
+            if hasattr(child, 'num_attn_heads'):
+                child.num_attn_heads = child.num_attn_heads // mp_size
             if hasattr(child, 'all_head_size'):
                 child.all_head_size = child.all_head_size // mp_size
             if hasattr(child, 'embed_dim'):