[init] baseline7 from project_6

ex_engine/csrc/common_fused_moe.h

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+/* Copyright 2025 The xLLM Authors. All Rights Reserved.
+
+Licensed under the Apache License, Version 2.0 (the "License");
+you may not use this file except in compliance with the License.
+You may obtain a copy of the License at
+
+    https://github.com/jd-opensource/xllm/blob/main/LICENSE
+
+Unless required by applicable law or agreed to in writing, software
+distributed under the License is distributed on an "AS IS" BASIS,
+WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+See the License for the specific language governing permissions and
+limitations under the License.
+==============================================================================*/
+
+#pragma once
+
+#include <torch/torch.h>
+
+#include "dense_mlp.h"
+#include "framework/model/model_args.h"
+#include "framework/model/model_input_params.h"
+#include "framework/parallel_state/parallel_args.h"
+#include "framework/quant_args.h"
+#include "framework/state_dict/state_dict.h"
+#include "framework/state_dict/utils.h"
+#include "fused_moe_base.h"
+#include "linear.h"
+
+namespace xllm {
+namespace layer {
+
+// FusedMoE common implementation - placeholder for unsupported backends
+// Actual implementations are in backend-specific fused_moe.h files.
+class FusedMoEImpl : public torch::nn::Module {
+ public:
+  FusedMoEImpl() = default;
+  FusedMoEImpl(const ModelArgs& model_args,
+               const FusedMoEArgs& moe_args,
+               const QuantArgs& quant_args,
+               const ParallelArgs& parallel_args,
+               const torch::TensorOptions& options);
+
+  torch::Tensor forward_experts(const torch::Tensor& hidden_states,
+                                const torch::Tensor& router_logits,
+                                bool enable_all2all_communication);
+  torch::Tensor forward(const torch::Tensor& hidden_states,
+                        const ModelInputParams& input_params);
+  void load_state_dict(const StateDict& state_dict);
+};
+TORCH_MODULE(FusedMoE);
+
+}  // namespace layer
+}  // namespace xllm