From 7bf4dd9f63a74f17dd21fa32d83d102e97eaec21 Mon Sep 17 00:00:00 2001
From: Grzegorz Kwasniewski
 <213329731+greg-kwasniewski1@users.noreply.github.com>
Date: Sat, 17 Jan 2026 10:02:06 +0100
Subject: [PATCH] [TRTLLM-10318][feat] Fixing Nemotron sharding: support for
 sharding buffers (#10319)

Signed-off-by: greg-kwasniewski1 <213329731+greg-kwasniewski1@users.noreply.github.com>
Signed-off-by: Lucas <11156568+lucaslie@users.noreply.github.com>
Signed-off-by: Grzegorz Kwasniewski <213329731+greg-kwasniewski1@users.noreply.github.com>
Co-authored-by: Lucas <11156568+lucaslie@users.noreply.github.com>
---
 .../auto_deploy/transform/library/fusion.py   |   6 +-
 .../transform/library/quantization.py         |  22 +-
 .../auto_deploy/transform/library/sharding.py | 131 ++++-----
 .../_torch/auto_deploy/utils/_graph.py        |   4 +-
 .../_torch/auto_deploy/utils/node_utils.py    | 147 ++++++----
 .../auto_deploy/utils/quantization_utils.py   |   6 +-
 .../library/test_tp_sharding.py               | 276 +++++++++++++++++-
 7 files changed, 450 insertions(+), 142 deletions(-)

diff --git a/tensorrt_llm/_torch/auto_deploy/transform/library/fusion.py b/tensorrt_llm/_torch/auto_deploy/transform/library/fusion.py
index 73191ede53..ac129f2d9f 100644
--- a/tensorrt_llm/_torch/auto_deploy/transform/library/fusion.py
+++ b/tensorrt_llm/_torch/auto_deploy/transform/library/fusion.py
@@ -13,7 +13,7 @@ from ...models.factory import ModelFactory
 from ...shim.interface import CachedSequenceInterface
 from ...utils.cuda_mem_tracker import cuda_memory_tracker
 from ...utils.logger import ad_logger
-from ...utils.node_utils import extract_param_names_from_node, is_linear_op, is_op
+from ...utils.node_utils import extract_weight_name, is_linear_op, is_op
 from ..interface import BaseTransform, SharedConfig, TransformInfo, TransformRegistry
 
 
@@ -36,7 +36,7 @@ def _insert_fused_gemm(gm: GraphModule, idx: int, parent_node: Node, linear_node
     y2 = y[:, out1:out1+out2]
     """
     # some info we need
-    keys_unfused = [extract_param_names_from_node(n)[0] for n in linear_nodes]
+    keys_unfused = [extract_weight_name(n) for n in linear_nodes]
     params_unfused = [gm.get_parameter(k) for k in keys_unfused]
     sizes_unfused = [p.size(0) for p in params_unfused]
     key_fused = f"fused_weight_{idx}"
@@ -128,7 +128,7 @@ class QuantizationFusionMixin(ABC):
     def _insert_fused_quant_gemm(
         self, gm: GraphModule, idx: int, parent_node: Node, linear_nodes: List[Node]
     ):
-        keys_unfused = [extract_param_names_from_node(n)[0] for n in linear_nodes]
+        keys_unfused = [extract_weight_name(n) for n in linear_nodes]
         params_unfused = [gm.get_parameter(k) for k in keys_unfused]
         sizes_unfused = [p.size(0) for p in params_unfused]
         key_fused = f"fused_weight_{idx}"
diff --git a/tensorrt_llm/_torch/auto_deploy/transform/library/quantization.py b/tensorrt_llm/_torch/auto_deploy/transform/library/quantization.py
index 21d1ccd234..5b2902d642 100644
--- a/tensorrt_llm/_torch/auto_deploy/transform/library/quantization.py
+++ b/tensorrt_llm/_torch/auto_deploy/transform/library/quantization.py
@@ -17,7 +17,7 @@ from ...custom_ops.quant import (
 from ...models.factory import ModelFactory
 from ...shim.interface import CachedSequenceInterface
 from ...utils.node_utils import (
-    extract_param_names_from_node,
+    extract_weight_nodes,
     get_quantization_params_from_linear_node,
     is_bmm_op,
     is_linear_op,
@@ -139,13 +139,13 @@ class Quantization(BaseTransform):
 
         The state_dict is also updated to contain the sharded weights.
         """
-        param_name, _ = extract_param_names_from_node(node)
-        original_weight = gm.get_parameter(param_name)
-        new_param = nn.Parameter(self.quantize_weight(original_weight), requires_grad=False)
-        modname, _, attrname = param_name.rpartition(".")
+        weight_nodes = extract_weight_nodes(node)
+        assert len(weight_nodes.weights) == 1, "Expected exactly one weight node"
+        lin_weight = weight_nodes.weights[0]
+        new_param = nn.Parameter(self.quantize_weight(lin_weight.tensor), requires_grad=False)
+        modname, _, attrname = lin_weight.node_key.rpartition(".")
 
-        submod = gm.get_submodule(modname)
-        setattr(submod, attrname, new_param)
+        setattr(lin_weight.submod, attrname, new_param)
 
         # check modelopt quantizers from graph
         if is_quantized_graph:
@@ -171,10 +171,12 @@ class Quantization(BaseTransform):
             )
             # Note: canonicalize_graph() will remove input/weight/output quantizer
 
-        for scale_name, scale in self.default_scales(original_weight.shape).items():
-            submod.register_buffer(scale_name, scale)
+        for scale_name, scale in self.default_scales(lin_weight.tensor.shape).items():
+            lin_weight.submod.register_buffer(scale_name, scale)
 
-        gm._register_load_state_dict_pre_hook(partial(self.load_hook, weight_name=param_name))
+        gm._register_load_state_dict_pre_hook(
+            partial(self.load_hook, weight_name=lin_weight.node_key)
+        )
 
         with gm.graph.inserting_before(node):
             scales = {}
diff --git a/tensorrt_llm/_torch/auto_deploy/transform/library/sharding.py b/tensorrt_llm/_torch/auto_deploy/transform/library/sharding.py
index 30df2a6842..26257cdfee 100644
--- a/tensorrt_llm/_torch/auto_deploy/transform/library/sharding.py
+++ b/tensorrt_llm/_torch/auto_deploy/transform/library/sharding.py
@@ -39,8 +39,8 @@ from ...utils.node_utils import (
     LayerSubgraph,
     LayerType,
     bfs,
-    extract_param_names_from_node,
-    extract_weight_node,
+    extract_weight_name,
+    extract_weight_nodes,
     filtered_nodes,
     get_all_layer_subgraphs,
     get_layer_after_linear_node,
@@ -49,7 +49,6 @@ from ...utils.node_utils import (
     is_any_moe_op,
     is_any_ssm_op,
     is_op,
-    num_users_of_weight_node,
     shape,
     subgraph,
 )
@@ -268,7 +267,7 @@ class WeightShardingInfo(ShardingTransformInfo):
     min_local_shape: int = 1
     layer_type: LayerType = LayerType.MLP
     # used for TP sharding of fused weights
-    fused_weight_dims: Optional[list] = None
+    fused_weight_dims: Optional[tuple] = None
 
     def quantization_cb(
         self,
@@ -437,7 +436,7 @@ class FP8WeightShardingInfo(QuantizationShardingMixin, WeightShardingInfo):
 
 
 def _shard_fp4_weight_scale(weight_scale, sharded_uint8_weight_shape, dim, rank, world_size):
-    assert weight_scale.dim() == 1
+    # assert weight_scale.dim() == 1
     weight_shape_original = list(sharded_uint8_weight_shape)
     weight_shape_original[dim] = weight_shape_original[dim] * world_size
     weight_shape_original[-1] *= 2
@@ -895,13 +894,10 @@ def _load_hook(
     # This is quite a hacky solution. A better solution would be to store extra_state in
     # the state_dict to identify whether the state_dict is sharded or not.
     key = prefix + param_key
-    ad_logger.debug(f"Sharder LOAD hook is called for '{key}'")
     if key not in state_dict:
         return
     p_to_load = state_dict[key]
-
     p_to_load = p_to_load if param_shape == p_to_load.shape else f_split(p_to_load)
-
     state_dict[key] = p_to_load
 
 
@@ -1124,6 +1120,7 @@ def init_process_grid_from_config(
         ShardingDim.EP: {"p": ep_rank, "w": ep_size},
         ShardingDim.TP: {"p": tp_rank, "w": tp_size},
     }
+    ad_logger.info(f"EP + TP sharding process grid: {process_grid}")
     config.process_grid = process_grid
     return process_grid
 
@@ -1187,10 +1184,6 @@ def shard_weight_tensor(
             fused_dims: list = fused_weight_dims,
             d: int = dim,
         ) -> torch.Tensor:
-            # dim_d = t.shape[d]
-            # num_parts = 1
-            # part_size = dim_d // num_parts
-            # fused_dims = [part_size] * num_parts
             return torch.cat(
                 [split_tensor(w) for w in torch.split(t, fused_dims, dim=d)],
                 dim=d,
@@ -1229,7 +1222,7 @@ def _shard_parameter_node(
     config: ShardingTransformConfig,
     add_dist: bool = False,
     min_local_shape: int = 1,
-    fused_weight_dims: Optional[list] = None,
+    fused_weight_dims: Optional[tuple] = None,
     quantization_cb: Optional[
         Callable[[GraphModule, nn.Module, Node, str, torch.Size, int, int, int], None]
     ] = None,
@@ -1243,67 +1236,58 @@ def _shard_parameter_node(
 
     rank, world_size = config.rank, config.world_size
     allreduce_strategy = config.allreduce_strategy.name
-    num_users = num_users_of_weight_node(node)
-    if num_users > 1 or num_users == 0:
-        ad_logger.warning(
-            f"Weight node {node} has {num_users} users. This is not supported for sharding. Skipping."
-        )
-        return
-    # get weight and bias key
-    weight_key, bias_key = extract_param_names_from_node(node)
-
-    modname = weight_key.rpartition(".")[0]
-    submod = gm.get_submodule(modname)
 
     # Shard weight using the unified function (also updates the parameter)
-    original_weight = gm.get_parameter(weight_key)
-    _, weight_new_shape = shard_weight_tensor(
-        gm=gm,
-        weight_tensor=original_weight,
-        param_key=weight_key,
-        dim=dim,
-        rank=rank,
-        world_size=world_size,
-        min_local_shape=min_local_shape,
-        fused_weight_dims=fused_weight_dims,
-    )
-
-    if bias_key is not None and dim == 0:
-        # update bias for dim 0 --> we can handle it like the weight
-        original_bias = gm.get_parameter(bias_key)
-        shard_weight_tensor(
+    weight_nodes = extract_weight_nodes(node)
+    for weight_node in weight_nodes.weights:
+        _, weight_new_shape = shard_weight_tensor(
             gm=gm,
-            weight_tensor=original_bias,
-            param_key=bias_key,
+            weight_tensor=weight_node.tensor,
+            param_key=weight_node.node_key,
             dim=dim,
             rank=rank,
             world_size=world_size,
             min_local_shape=min_local_shape,
             fused_weight_dims=fused_weight_dims,
         )
-    elif bias_key is not None and rank != world_size - 1:
-        # update the bias for dim 1 --> in this case only the last rank gets the bias to avoid
-        # double counting it. For all other we will delete the bias.
-        args = list(node.args)
-        node_bias = args[2]
-        args[2] = None
-        node.args = tuple(args)
-        gm.graph.erase_node(node_bias)
-        bias_param_name = bias_key.rpartition(".")[-1]
-        setattr(submod, bias_param_name, None)
-        gm._register_load_state_dict_pre_hook(partial(_load_hook_remove, param_key=bias_key))
+        if quantization_cb is not None:
+            quantization_cb(
+                gm=gm,
+                submod=weight_node.submod,
+                node=node,
+                weight_key=weight_node.node_key,
+                weight_new_shape=weight_new_shape,
+                dim=dim,
+                rank=rank,
+                world_size=world_size,
+            )
 
-    if quantization_cb is not None:
-        quantization_cb(
-            gm=gm,
-            submod=submod,
-            node=node,
-            weight_key=weight_key,
-            weight_new_shape=weight_new_shape,
-            dim=dim,
-            rank=rank,
-            world_size=world_size,
-        )
+    for bias_node in weight_nodes.biases:
+        if dim == 0:
+            # update bias for dim 0 --> we can handle it like the weight
+            shard_weight_tensor(
+                gm=gm,
+                weight_tensor=bias_node.tensor,
+                param_key=bias_node.node_key,
+                dim=dim,
+                rank=rank,
+                world_size=world_size,
+                min_local_shape=min_local_shape,
+                fused_weight_dims=fused_weight_dims,
+            )
+        elif bias_node is not None and rank != world_size - 1:
+            # update the bias for dim 1 --> in this case only the last rank gets the bias to avoid
+            # double counting it. For all other we will delete the bias.
+            args = list(node.args)
+            node_bias = args[2]
+            args[2] = None
+            node.args = tuple(args)
+            gm.graph.erase_node(node_bias)
+            bias_param_name = bias_node.node_key.rpartition(".")[-1]
+            setattr(bias_node.submod, bias_param_name, None)
+            gm._register_load_state_dict_pre_hook(
+                partial(_load_hook_remove, param_key=bias_node.node_key)
+            )
 
     # # # column shard with no gather: the output is sharded
     if not add_dist:
@@ -1633,7 +1617,7 @@ def _process_ssm_sharding(
             config=config,
             dist_op=None,
             min_local_shape=1,
-            fused_weight_dims=fused_weight_dims["in_proj"],
+            fused_weight_dims=tuple(fused_weight_dims["in_proj"]),
             layer_type=LayerType.SSM,
         )
     ):
@@ -1702,7 +1686,7 @@ def _process_ssm_sharding(
         fused_dims = None
         for k, v in fused_weight_dims.items():
             if k in weight_key:
-                fused_dims = v
+                fused_dims = tuple(v)
                 break
 
         # Shard the weight tensor (also updates the parameter in the module)
@@ -1887,7 +1871,7 @@ def _determine_fused_weight_dims(
                 ad_logger.warning(
                     f"Fused weight dims {fused_weight_dims} do not sum to weight dim {weight_dim}. Skipping."
                 )
-                return
+                return None
     chunk_nodes = list(filtered_nodes(linear_node.users, ops=torch.ops.aten.chunk))
     if len(chunk_nodes) > 0:
         assert len(linear_nodes) == 1
@@ -1896,6 +1880,8 @@ def _determine_fused_weight_dims(
         num_chunks = chunk_nodes[0].args[1]
         weight_dim = shape(linear_node)[2]
         fused_weight_dims = [weight_dim // num_chunks] * num_chunks
+    if fused_weight_dims is not None:
+        fused_weight_dims = tuple(fused_weight_dims)
     return fused_weight_dims
 
 
@@ -2046,9 +2032,9 @@ def detect_sharding_from_config(
 
     for lin_node in linear_nodes:
         # use node's weight name to get the module name
-        module_name = extract_weight_node(lin_node).target
+        weight_name = extract_weight_name(lin_node)
 
-        if any(attn_name in module_name for attn_name in attn_names):
+        if any(attn_name in weight_name for attn_name in attn_names):
             # find the next attention node and infer the head_dim
             next_attention_node, _ = bfs(
                 lin_node, is_any_attention_op, attr_next="users", include_root=False
@@ -2072,7 +2058,7 @@ def detect_sharding_from_config(
             # Then we escape dots, and finally we replace @ with .*
             pattern_string = pattern_string.replace("*", "@")
             pattern_regex = re.escape(pattern_string).replace("@", ".*")
-            if re.match(pattern_regex, module_name):
+            if re.match(pattern_regex, weight_name):
                 # we have a match. Get the config for this layer
                 config = tp_plan[key]
 
@@ -2111,7 +2097,7 @@ def detect_sharding_from_config(
                 elif "local" in config:
                     # Check if this applies to shared experts in EP parallelism.
                     # If yes, apply the TP col-row shard.
-                    if "shared" in module_name:
+                    if "shared" in weight_name:
                         col_row_action = config.replace("local_", "")
                         if col_row_action == "colwise":
                             transform_container.add(
@@ -2235,7 +2221,6 @@ def detect_column_row_shard(
     min_local_shape is the minimum size of the local tensor shard, to prevent TP parallelism
     splitting, e.g., the individual heads into smaller shards.
     """
-    # test_moe_variants()
     ad_logger.debug("Before sharding graph: " + str(gm))
     config = transform_container.config
     world_size = config.world_size
@@ -2340,7 +2325,7 @@ def detect_column_row_shard(
     # simple shard remaining linear nodes
     if config.shard_all_unprocessed:
         num_simple_shards += _process_simple_shard(unprocessed_linear_nodes, transform_container)
-    num_column_row_shards += num_ssm_shards
+    num_column_row_shards += num_ssm_shards + num_mla_shards
     num_shards = num_simple_shards + num_column_row_shards
     ad_logger.info(
         f"Heuristics found {num_shards} TP shards. Simple: {num_simple_shards}, "
diff --git a/tensorrt_llm/_torch/auto_deploy/utils/_graph.py b/tensorrt_llm/_torch/auto_deploy/utils/_graph.py
index 04db9bd80d..e1a922b59f 100644
--- a/tensorrt_llm/_torch/auto_deploy/utils/_graph.py
+++ b/tensorrt_llm/_torch/auto_deploy/utils/_graph.py
@@ -354,7 +354,7 @@ def get_input_embeddings(model: nn.Module) -> torch.Tensor:
             op="call_function", target=torch.ops.aten.embedding.default
         )
         for node in found_nodes:
-            embedding_weights.append(get_weight_tensor(gm, node))
+            embedding_weights.append(get_weight_tensor(node))
 
     if hasattr(model, "get_input_embeddings"):
         embedding_weights.append(model.get_input_embeddings())
@@ -400,7 +400,7 @@ def get_lm_head_node(gm: GraphModule, output_node: Optional[Node] = None) -> Nod
 def get_lm_head_weights(model: nn.Module) -> torch.Tensor:
     gm, output_node = get_output_node(model)
     lm_head_node = get_lm_head_node(gm, output_node)
-    return get_weight_tensor(gm, lm_head_node)
+    return get_weight_tensor(lm_head_node)
 
 
 def get_attr_by_name(obj, name):
diff --git a/tensorrt_llm/_torch/auto_deploy/utils/node_utils.py b/tensorrt_llm/_torch/auto_deploy/utils/node_utils.py
index 795bfa4f2d..720deab984 100644
--- a/tensorrt_llm/_torch/auto_deploy/utils/node_utils.py
+++ b/tensorrt_llm/_torch/auto_deploy/utils/node_utils.py
@@ -8,6 +8,7 @@ from typing import Callable, Iterable, List, Optional, Tuple, Union
 
 import torch
 from pydantic import BaseModel, ConfigDict
+from torch import nn
 from torch._ops import OpOverload, OpOverloadPacket
 from torch.fx import GraphModule, Node
 
@@ -51,6 +52,19 @@ class LayerSubgraph(BaseModel):
     min_local_shape: int = 1
 
 
+class WeightNode(BaseModel):
+    model_config = ConfigDict(arbitrary_types_allowed=True)
+    node: Node
+    tensor: torch.Tensor
+    node_key: str
+    submod: nn.Module
+
+
+class WeightNodes(BaseModel):
+    weights: list[WeightNode]
+    biases: list[WeightNode]
+
+
 @dataclass
 class modelopt_quant_params:
     input_node: torch.fx.node.Node = None
@@ -129,8 +143,26 @@ def get_quantization_params_from_linear_node(linear_op: torch.fx.node.Node):
     return input_params, weight_params, output_params
 
 
-def extract_weight_node(node: Node) -> int:
-    """Extracts the weight node from the given parametrized node"""
+def extract_weight_name(node: Node) -> str:
+    weight_nodes = extract_weight_nodes(node)
+    return weight_nodes.weights[0].node_key
+
+
+def get_param_or_buffer(tensor_name: str, gm: GraphModule) -> torch.Tensor:
+    if tensor_name in dict(gm.named_parameters()):
+        return gm.get_parameter(tensor_name)
+    elif tensor_name in dict(gm.named_buffers()):
+        return gm.get_buffer(tensor_name)
+    else:
+        raise KeyError(f"Tensor {tensor_name} not found in the graph")
+
+
+def extract_weight_nodes(node: Node) -> WeightNodes:
+    """Extracts the list of weight node and optional bias node from the given parametrized node"""
+    gm = node.graph.owning_module
+    param_names = {name for name, _ in gm.named_parameters()}.union(
+        {name for name, _ in gm.named_buffers()}
+    )
 
     def find_get_attr_node(weight_node: Node) -> Node:
         """Recursively traverse inputs of allowed nodes to find a node with 'get_attr' op."""
@@ -141,7 +173,12 @@ def extract_weight_node(node: Node) -> int:
             torch.ops.aten.view.default,
         }
 
-        if weight_node.op == "get_attr":
+        if (
+            weight_node.op == "get_attr"
+            and weight_node.target in param_names
+            and has_shape(weight_node)
+            and len(shape(weight_node)) > 0
+        ):
             return weight_node
 
         # If node is not in the list of allowable ops then return None
@@ -155,57 +192,56 @@ def extract_weight_node(node: Node) -> int:
         return None
 
     if is_op(node, torch.ops.aten.bmm):
-        weight_node = node.args[1]
+        # no bias for bmm
+        weight_node = find_get_attr_node(node.args[1])
+        return WeightNodes(
+            weights=[
+                WeightNode(
+                    node=node.args[1],
+                    node_key=weight_node.target,
+                    tensor=get_param_or_buffer(weight_node.target, gm),
+                    submod=gm.get_submodule(weight_node.target.rpartition(".")[0]),
+                )
+            ],
+            biases=[],
+        )
     # for other parametrized nodes, we need to find the weight node
     else:
-        weight_nodes = [
-            n for n in node.args if isinstance(n, Node) and find_get_attr_node(n) is not None
+        all_weight_nodes = [
+            attr_node
+            for n in node.all_input_nodes
+            if (attr_node := find_get_attr_node(n)) is not None
         ]
-        # can be two weights (if bias weight is present)
-        weight_node = None
-        if weight_nodes:
-            weight_node = weight_nodes[0]
-        # for modelopt quantized graph, there will be a quantize_op
-        _, weight_params, _ = get_quantization_params_from_linear_node(node)
-        weight_node = weight_params.input_node if weight_params else weight_node
-        assert weight_node is not None, "Expected at least one weight node in the parametrized node"
-    return find_get_attr_node(weight_node)
+        # separate weight nodes and bias nodes
+        bias_nodes = [n for n in all_weight_nodes if n.target.endswith("bias")]
+        weight_nodes = [n for n in all_weight_nodes if n not in bias_nodes]
+        weight_nodes = [
+            WeightNode(
+                node=n,
+                node_key=n.target,
+                submod=gm.get_submodule(n.target.rpartition(".")[0]),
+                tensor=get_param_or_buffer(n.target, gm),
+            )
+            for n in weight_nodes
+        ]
+        bias_nodes = [
+            WeightNode(
+                node=n,
+                node_key=n.target,
+                submod=gm.get_submodule(n.target.rpartition(".")[0]),
+                tensor=get_param_or_buffer(n.target, gm),
+            )
+            for n in bias_nodes
+        ]
+    return WeightNodes(weights=weight_nodes, biases=bias_nodes)
 
 
 def num_users_of_weight_node(node: Node) -> int:
     """Returns the number of users of the weight node of the given parametrized node."""
-    weight_node = extract_weight_node(node)
+    weight_node = extract_weight_nodes(node).weights[0].node
     return len(weight_node.users) if weight_node is not None else 0
 
 
-def extract_param_names_from_node(node: Node) -> Tuple[str, Optional[str]]:
-    """Extracts the name of the parameter associated with the given parametrized node.
-
-    Args:
-        node: node with weight parameters in the graph.
-    """
-    weight_node = extract_weight_node(node)
-
-    assert weight_node, "Cannot identify weight parameter of linear node."
-
-    # Map arg to named parameter
-    weight_name = weight_node.target
-
-    # check for bias
-    if is_op(node, torch.ops.aten.bmm):
-        bias_node = node.args[2] if len(node.args) > 2 else None
-    else:
-        weight_nodes = [n for n in node.args if isinstance(n, Node) and n.op == "get_attr"]
-        if len(weight_nodes) > 1:
-            bias_node = weight_nodes[1]
-        else:
-            bias_node = None
-    assert bias_node is None or bias_node.op == "get_attr"
-    bias_name = bias_node.target if bias_node is not None else None
-
-    return weight_name, bias_name
-
-
 def get_op_overload_packet(node: Union[OpOverloadPacket, OpOverload]) -> OpOverloadPacket:
     """Get the overload packet from the op overload."""
     if isinstance(node, OpOverloadPacket):
@@ -335,6 +371,15 @@ def is_any_ssm_op(node: Node) -> bool:
     )
 
 
+def is_any_conv_op(node: Node) -> bool:
+    return is_op(
+        node,
+        ops=[
+            torch.ops.auto_deploy.torch_causal_conv1d,
+        ],
+    )
+
+
 def is_any_attention_op(node: Node) -> bool:
     return is_op(
         node,
@@ -499,8 +544,10 @@ def get_all_layer_subgraphs(gm: GraphModule) -> List[List[Node]]:
         # closing is the last linear node in the layer
         layer_subgraph = get_layer_after_linear_node(linear_nodes, terminating_indices)
         if layer_subgraph.opening_nodes is not None and len(layer_subgraph.opening_nodes) > 0:
-            unprocessed_linear_nodes -= set(layer_subgraph.opening_nodes) | set(
-                [layer_subgraph.terminating_node]
+            unprocessed_linear_nodes -= (
+                set(layer_subgraph.opening_nodes)
+                | set([layer_subgraph.terminating_node])
+                | set(layer_subgraph.subgraph_nodes)
             )
             layer_subgraphs.append(layer_subgraph)
         last_lin_index = terminating_indices[-1] + 1
@@ -746,7 +793,7 @@ def get_weight_shape(node: Node, dim: Optional[int] = None) -> Optional[Union[in
     """Get the shape of the weight node."""
     if not is_any_lin_op(node):
         return None
-    s = list(shape(extract_weight_node(node)))
+    s = list(shape(extract_weight_nodes(node).weights[0].node))
     if len(s) == 0:
         return None
     if is_fp4_op(node):
@@ -936,10 +983,10 @@ def shape(node: Node) -> Tuple[int, ...]:
     return node.meta["val"].shape
 
 
-def get_weight_tensor(gm: GraphModule, node: Node) -> "torch.Tensor":
+def get_weight_tensor(node: Node) -> torch.Tensor:
     """Extract the weight tensor from a node within a GraphModule."""
-    weight_name = extract_param_names_from_node(node)[0]
-    return gm.get_parameter(weight_name)
+    weight_nodes = extract_weight_nodes(node)
+    return weight_nodes.weights[0].tensor
 
 
 def draw_graph(gm: GraphModule, filename: str):
diff --git a/tensorrt_llm/_torch/auto_deploy/utils/quantization_utils.py b/tensorrt_llm/_torch/auto_deploy/utils/quantization_utils.py
index aee98c3771..889b06edb0 100644
--- a/tensorrt_llm/_torch/auto_deploy/utils/quantization_utils.py
+++ b/tensorrt_llm/_torch/auto_deploy/utils/quantization_utils.py
@@ -8,7 +8,7 @@ from torch.fx import GraphModule, Node
 from ..custom_ops.quant import FP4_GLOBAL_SCALE_MAX, FP8_MAX
 from .logger import ad_logger
 from .node_utils import (
-    extract_param_names_from_node,
+    extract_weight_name,
     get_quantization_params_from_linear_node,
     is_bmm_op,
     is_linear_op,
@@ -117,8 +117,8 @@ def should_skip_quantization(
     else:
         if not (is_linear_op(node_or_name) or is_bmm_op(node_or_name)):
             return True
-        param_name, _ = extract_param_names_from_node(node_or_name)
-        modname, _, _ = param_name.rpartition(".")
+        weight_name = extract_weight_name(node_or_name)
+        modname = weight_name.rpartition(".")[0]
 
     return any(fnmatch(modname, pattern) for pattern in excluded_patterns)
 
diff --git a/tests/unittest/_torch/auto_deploy/unit/multigpu/transformations/library/test_tp_sharding.py b/tests/unittest/_torch/auto_deploy/unit/multigpu/transformations/library/test_tp_sharding.py
index b4f82edcfa..e226d85c61 100644
--- a/tests/unittest/_torch/auto_deploy/unit/multigpu/transformations/library/test_tp_sharding.py
+++ b/tests/unittest/_torch/auto_deploy/unit/multigpu/transformations/library/test_tp_sharding.py
@@ -1,6 +1,7 @@
 """Tests for basic graph sharding."""
 
 from functools import partial
+from types import SimpleNamespace
 from typing import Type
 
 import pytest
@@ -13,6 +14,7 @@ from _model_test_utils import FakeFP8Linear
 
 import tensorrt_llm._torch.auto_deploy.distributed.common as dist_common
 from tensorrt_llm._torch.auto_deploy.export import torch_export_to_gm
+from tensorrt_llm._torch.auto_deploy.models.custom.modeling_nemotron_h import NemotronHMamba2Mixer
 from tensorrt_llm._torch.auto_deploy.transform.library.sharding import (
     FP8WeightShardingInfo,
     LayerType,
@@ -35,6 +37,14 @@ base_model_tp_plan = {
     "linear1": "colwise",
     "linear2": "rowwise",
     "linear": "gather",
+    # Mamba2 specific projections
+    "in_proj": "mamba",
+    "out_proj": "rowwise",
+    # MLA specific projections
+    "q_a_proj": "gather",
+    "q_b_proj": "colwise",
+    "kv_a_proj_with_mqa": "gather",
+    "kv_b_proj": "colwise",
     # "input_layernorm.weight": "sequence_parallel",
     # "post_attention_layernorm.weight": "sequence_parallel",
     # "norm.weight": "sequence_parallel",
@@ -50,7 +60,6 @@ base_model_tp_plan = {
 }
 
 predefined_config = {
-    "head_dim": 8,
     "tp_plan": base_model_tp_plan,
 }
 
@@ -125,6 +134,75 @@ class FP8MLP(nn.Module):
         return self.linear2(y)
 
 
+class MLA_Block(nn.Module):
+    """Multi-Latent Attention block - simplified standalone version.
+
+    Based on DeepSeek MLA architecture with KV compression.
+    This is a minimal, self-contained implementation for testing sharding patterns.
+    """
+
+    def __init__(
+        self,
+        hidden_size: int,
+        num_heads: int,
+        q_lora_rank: int,
+        kv_lora_rank: int,
+        qk_nope_head_dim: int,
+        qk_rope_head_dim: int,
+        v_head_dim: int,
+        bias: bool = False,
+    ):
+        super().__init__()
+        self.hidden_size = hidden_size
+        self.num_heads = num_heads
+        self.kv_lora_rank = kv_lora_rank
+        self.qk_head_dim = qk_nope_head_dim + qk_rope_head_dim
+        self.qk_nope_head_dim = qk_nope_head_dim
+        self.qk_rope_head_dim = qk_rope_head_dim
+        self.v_head_dim = v_head_dim
+
+        # KV compression path (not sharded - gather)
+        self.kv_a_proj_with_mqa = nn.Linear(hidden_size, kv_lora_rank + qk_rope_head_dim, bias=bias)
+
+        # KV decompression (sharded column-wise)
+        self.kv_b_proj = nn.Linear(
+            kv_lora_rank, num_heads * (qk_nope_head_dim + v_head_dim), bias=False
+        )
+
+        # Query path (sharded column-wise)
+        self.q_a_proj = nn.Linear(hidden_size, q_lora_rank, bias=bias)
+        self.q_b_proj = nn.Linear(q_lora_rank, num_heads * self.qk_head_dim, bias=bias)
+        self.q_a_layernorm = nn.LayerNorm(q_lora_rank)
+        # Output projection (sharded row-wise)
+        self.o_proj = nn.Linear(num_heads * v_head_dim, hidden_size, bias=bias)
+
+    @torch.no_grad()
+    def forward(self, x: torch.Tensor) -> torch.Tensor:
+        b, s, _ = x.shape
+
+        # Compress KV to latent
+        compressed_kv_rope = self.kv_a_proj_with_mqa(x)  # (b, s, kv_lora_rank + rope_dim)
+        compressed_kv = compressed_kv_rope[:, :, : self.kv_lora_rank]  # (b, s, kv_lora_rank)
+
+        # Decompress to full K and V
+        kv = self.kv_b_proj(compressed_kv)  # (b, s, num_heads * (qk_nope + v))
+        k_nope_v = kv.view(b, s, self.num_heads, self.qk_nope_head_dim + self.v_head_dim)
+        k_nope = k_nope_v[:, :, :, : self.qk_nope_head_dim]
+        v = k_nope_v[:, :, :, self.qk_nope_head_dim :]
+
+        # Query projection
+        # q = q_b_proj @ (layernorm(q_a_proj @ x))
+        q = self.q_b_proj(self.q_a_layernorm(self.q_a_proj(x)))  # (b, s, num_heads * qk_head_dim)
+        q = q.view(b, s, self.num_heads, self.qk_head_dim)
+        q_nope = q[:, :, :, : self.qk_nope_head_dim]
+
+        attn_out = torch.ops.auto_deploy.torch_attention(q_nope, k_nope, v, is_causal=True)
+        attn_out = attn_out.contiguous().view(b, s, -1)
+        # Output projection
+        output = self.o_proj(attn_out)
+        return output
+
+
 def _run_sharding_execution_job(
     model_cls: nn.Module,
     dist_op_expected: str,
@@ -137,6 +215,7 @@ def _run_sharding_execution_job(
     batch_size = 4
     sequence_len = 8
     num_features = 32
+    skip_output_assert = False
 
     # GQA specific parameters
     num_heads = 4
@@ -150,6 +229,54 @@ def _run_sharding_execution_job(
         ).to(device="cuda", dtype=torch.float16)
     elif model_cls == FP8MLP:
         model = model_cls(num_features, num_features, bias=bias).to("cuda")
+    elif model_cls == NemotronHMamba2Mixer:
+        # Create config for Mamba2 based on Nemotron models
+        # Scaled down from typical values: hidden_size=5120, ssm_state_size=128
+        mamba_config = SimpleNamespace(
+            hidden_size=num_features,
+            ssm_state_size=16,  # Scaled from 128
+            mamba_num_heads=num_heads,
+            mamba_head_dim=num_features // num_heads,  # 8
+            n_groups=num_heads,  # Typical value
+            chunk_size=256,
+            conv_kernel=4,
+            use_conv_bias=bias,
+            use_bias=bias,
+            mamba_hidden_act="silu",
+            layer_norm_epsilon=1e-5,
+            time_step_limit=(0.0, float("inf")),
+            time_step_min=0.001,
+            time_step_max=0.1,
+            time_step_floor=1e-4,
+            initializer_range=0.02,
+            rescale_prenorm_residual=False,
+            residual_in_fp32=False,
+            num_hidden_layers=1,
+        )
+        model = model_cls(mamba_config, layer_idx=0).to(device="cuda", dtype=torch.float16)
+    elif model_cls == MLA_Block:
+        # Use actual DeepSeek-V3/R1 production values
+        # From HuggingFace config (HunYuanPretrainedConfig defaults):
+        # hidden_size=4096, num_attention_heads=32
+        # kv_lora_rank=512, q_lora_rank=1536
+        # qk_rope_head_dim=64, v_head_dim=128, qk_nope_head_dim=128
+        num_heads_mla = 16
+        qk_nope_head_dim = 64
+        qk_rope_head_dim = 32
+        v_head_dim = 64
+        kv_lora_rank = 256
+        skip_output_assert = True
+
+        model = model_cls(
+            hidden_size=num_features,
+            num_heads=num_heads_mla,
+            q_lora_rank=kv_lora_rank,
+            kv_lora_rank=kv_lora_rank,
+            qk_nope_head_dim=qk_nope_head_dim,
+            qk_rope_head_dim=qk_rope_head_dim,
+            v_head_dim=v_head_dim,
+            bias=bias,
+        ).to(device="cuda", dtype=torch.float16)
     else:
         model = model_cls(num_features, num_features, bias=bias).to(
             device="cuda", dtype=torch.float16
@@ -178,6 +305,11 @@ def _run_sharding_execution_job(
             num_params = W_q_local_size + W_k_local_size + W_v_local_size + W_o_local_size
         else:
             num_params = num_p_og // world_size + num_update
+        if model_cls == MLA_Block:
+            # since q_a_proj is simple-sharded and followed by q_a_layernorm, the layernorm params
+            # are NOT sharded - they have to be replicated. To account for this, we need to add the
+            # number of parameters of the layernorm (weight and bias)to the number of parameters of the model.
+            num_params += 2 * kv_lora_rank * (world_size - 1) // world_size
         return num_params
 
     def verify_local_weight_sizes(gm) -> bool:
@@ -223,6 +355,7 @@ def _run_sharding_execution_job(
         gm_transformed,
         check_transformed_graph=combined_graph_check,
         _get_expected_num_params=_get_expected_num_params,
+        skip_output_assert=skip_output_assert,
     )
 
 
@@ -248,6 +381,47 @@ def _run_pattern_detection_job(
             hidden_size=num_features,
             num_key_value_heads=num_key_value_heads,
         ).to(device="cuda", dtype=torch.float16)
+    elif model_cls == NemotronHMamba2Mixer:
+        # Create config for Mamba2
+        mamba_config = SimpleNamespace(
+            hidden_size=num_features,
+            ssm_state_size=16,
+            mamba_num_heads=num_heads,
+            mamba_head_dim=num_features // num_heads,
+            n_groups=num_heads,
+            chunk_size=256,
+            conv_kernel=4,
+            use_conv_bias=bias,
+            use_bias=bias,
+            mamba_hidden_act="silu",
+            layer_norm_epsilon=1e-5,
+            time_step_limit=(0.0, float("inf")),
+            time_step_min=0.001,
+            time_step_max=0.1,
+            time_step_floor=1e-4,
+            initializer_range=0.02,
+            rescale_prenorm_residual=False,
+            residual_in_fp32=False,
+            num_hidden_layers=1,
+        )
+        model = model_cls(mamba_config, layer_idx=0).to(device="cuda", dtype=torch.float16)
+    elif model_cls == MLA_Block:
+        # Create simplified MLA based on DeepSeek-V3 architecture
+        qk_nope_head_dim = 2
+        qk_rope_head_dim = 1
+        v_head_dim = 2
+        kv_lora_rank = 8
+
+        model = model_cls(
+            hidden_size=num_features,
+            num_heads=num_heads,
+            q_lora_rank=kv_lora_rank,
+            kv_lora_rank=kv_lora_rank,
+            qk_nope_head_dim=qk_nope_head_dim,
+            qk_rope_head_dim=qk_rope_head_dim,
+            v_head_dim=v_head_dim,
+            bias=bias,
+        ).to(device="cuda", dtype=torch.float16)
     else:
         model = model_cls(num_features, num_features, bias=bias).to(
             device="cuda", dtype=torch.float16
@@ -344,6 +518,102 @@ def _run_pattern_detection_job(
                             min_local_shape=1,
                         )
                     )
+        elif model_cls == NemotronHMamba2Mixer:
+            for node in gm.graph.nodes:
+                if is_linear_op(node):
+                    # in_proj should be sharded column-wise
+                    # out_proj should be sharded row-wise with all_reduce
+                    if "out_proj" in node.args[1].name:
+                        dim = SplitDimension.ROW
+                        dist_op = "all_reduce"
+                        fused_weight_dims = None
+                    else:
+                        dim = SplitDimension.COLUMN
+                        dist_op = None
+                        fused_weight_dims = (
+                            num_features,
+                            num_features,
+                            16 * num_heads,
+                            16 * num_heads,
+                            num_heads,
+                        )
+                    expected_transformations.append(
+                        WeightShardingInfo(
+                            target_node=node.name,
+                            split_dim=dim,
+                            config=config,
+                            dist_op=dist_op,
+                            min_local_shape=1,
+                            layer_type=LayerType.SSM,
+                            fused_weight_dims=fused_weight_dims,
+                        )
+                    )
+                if is_op(node, torch.ops.auto_deploy.torch_causal_conv1d):
+                    expected_transformations.append(
+                        WeightShardingInfo(
+                            target_node=node.name,
+                            split_dim=SplitDimension.COLUMN,
+                            config=config,
+                            dist_op=None,
+                            min_local_shape=1,
+                            layer_type=LayerType.SSM,
+                            fused_weight_dims=(num_features, 16 * num_heads, 16 * num_heads),
+                        )
+                    )
+                if is_op(node, torch.ops.auto_deploy.torch_ssm):
+                    expected_transformations.append(
+                        WeightShardingInfo(
+                            target_node=node.name,
+                            split_dim=SplitDimension.COLUMN,
+                            config=config,
+                            dist_op=None,
+                            min_local_shape=1,
+                            layer_type=LayerType.SSM,
+                            fused_weight_dims=None,
+                        )
+                    )
+                if len(node.args) > 1 and "norm_weight" in node.args[0].name:
+                    expected_transformations.append(
+                        WeightShardingInfo(
+                            target_node=node.name,
+                            split_dim=SplitDimension.COLUMN,
+                            config=config,
+                            dist_op=None,
+                            min_local_shape=1,
+                            layer_type=LayerType.SSM,
+                            fused_weight_dims=None,
+                        )
+                    )
+        elif model_cls == MLA_Block:
+            for node in gm.graph.nodes:
+                if is_linear_op(node):
+                    # kv_a_proj_with_mqa: gather (no sharding)
+                    # q_b_proj/kv_b_proj: column-wise
+                    # o_proj: row-wise with all_reduce
+                    min_local_shape = 2
+                    if "o_proj" in node.args[1].name:
+                        dim = SplitDimension.ROW
+                        dist_op = "all_reduce"
+                    elif (
+                        "kv_a_proj_with_mqa" in node.args[1].name or "q_a_proj" in node.args[1].name
+                    ):
+                        # This is simple-shard gather
+                        dim = SplitDimension.COLUMN
+                        dist_op = "all_gather"
+                        min_local_shape = 1
+                    else:
+                        dim = SplitDimension.COLUMN
+                        dist_op = None
+                    expected_transformations.append(
+                        WeightShardingInfo(
+                            target_node=node.name,
+                            split_dim=dim,
+                            config=config,
+                            dist_op=dist_op,
+                            min_local_shape=min_local_shape,
+                            layer_type=LayerType.MLA,
+                        )
+                    )
 
     # get detected transformations
     optimizer = InferenceOptimizer(
@@ -378,6 +648,8 @@ def _run_pattern_detection_job(
         (FP8MLP, "torch_dist_all_reduce"),
         (nn.Linear, "torch_dist_all_gather"),
         (GQA_Block, "torch_dist_all_reduce"),
+        (NemotronHMamba2Mixer, "torch_dist_all_reduce"),
+        (MLA_Block, "torch_dist_all_reduce"),
     ),
 )
 def test_sharding(
@@ -403,6 +675,8 @@ def test_sharding(
         (FP8MLP, "torch_dist_all_reduce"),
         (nn.Linear, "torch_dist_all_gather"),
         (GQA_Block, "torch_dist_all_reduce"),
+        (NemotronHMamba2Mixer, "torch_dist_all_reduce"),
+        (MLA_Block, "torch_dist_all_reduce"),
     ),
 )
 def test_sharding_pattern_detection(