S1/ZZZJ_#199/gather_nd_cuda.py

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+import torch
+from torch.utils.cpp_extension import load_inline
+
+gather_nd_source = """
+#include <torch/extension.h>
+#include <cuda_runtime.h>
+
+
+
+__global__ void gather_nd_float4_kernel(
+    const float* __restrict__ params, 
+    const int* __restrict__ indices, 
+    float* __restrict__ output, 
+    int N, 
+    int C,
+    int stride_b, int stride_h, int stride_w) 
+{
+
+    int idx = blockIdx.x * blockDim.x + threadIdx.x;
+
+    if (idx < N) {
+
+        int base_idx = idx * 3;
+        int b = indices[base_idx];
+        int h = indices[base_idx + 1];
+        int w = indices[base_idx + 2];
+
+        long long src_offset = (long long)b * stride_b + (long long)h * stride_h + (long long)w * stride_w;
+        
+
+        long long dst_offset = (long long)idx * C;
+
+    
+        const float4* src_ptr = reinterpret_cast<const float4*>(params + src_offset);
+        float4* dst_ptr = reinterpret_cast<float4*>(output + dst_offset);
+
+        int vec_len = C / 4;
+   
+        for (int i = 0; i < vec_len; ++i) {
+            dst_ptr[i] = src_ptr[i];
+        }
+    }
+}
+
+torch::Tensor gather_nd_cuda(torch::Tensor params, torch::Tensor indices) {
+    
+    int N = indices.size(0);
+    int C = params.size(3);
+    int H = params.size(1);
+    int W = params.size(2);
+    
+
+    int stride_w = C;
+    int stride_h = W * C;
+    int stride_b = H * W * C;
+
+    auto output = torch::empty({N, C}, params.options());
+    
+    const int block = 256;
+    const int grid = (N + block - 1) / block;
+ 
+    gather_nd_float4_kernel<<<grid, block>>>(
+        params.data_ptr<float>(),
+        indices.data_ptr<int>(),
+        output.data_ptr<float>(),
+        N, C,
+        stride_b, stride_h, stride_w
+    );
+    
+    return output;
+}
+"""
+
+cpp_source = "torch::Tensor gather_nd_cuda(torch::Tensor params, torch::Tensor indices);"
+
+gather_nd_module = load_inline(
+    name="gather_nd_extension",
+    cpp_sources=cpp_source,
+    cuda_sources=gather_nd_source,
+    functions=["gather_nd_cuda"],
+    verbose=True,
+    with_cuda=True
+)
+
+class ModelNew(torch.nn.Module):
+    def __init__(self):
+        super(ModelNew, self).__init__()
+        self.cuda_op = gather_nd_module
+
+    def forward(self, params, indices):
+
+        return self.cuda_op.gather_nd_cuda(params.contiguous(), indices.int().contiguous())

S1/ZZZJ_#199/gather_nd_torch.py

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+import torch
+import torch.nn as nn
+
+torch.backends.cuda.matmul.allow_tf32 = False
+
+class Model(nn.Module):
+    def __init__(self):
+        super(Model, self).__init__()
+
+    def forward(self, params: torch.Tensor, indices: torch.Tensor) -> torch.Tensor:
+       
+        b = indices[:, 0]
+        h = indices[:, 1]
+        w = indices[:, 2]
+        
+        return params[b, h, w]
+
+B, H, W, C = 4, 256, 256, 128
+N = 1024 * 1024 
+
+def get_inputs():
+    params = torch.randn(B, H, W, C, dtype=torch.float32).cuda()
+
+    idx_b = torch.randint(0, B, (N,)).cuda()
+    idx_h = torch.randint(0, H, (N,)).cuda()
+    idx_w = torch.randint(0, W, (N,)).cuda()
+    
+    indices = torch.stack([idx_b, idx_h, idx_w], dim=1).long() # [N, 3]
+    
+    return [params, indices]
+
+def get_init_inputs():
+    return []

S1/ZZZJ_#199/prompt.txt

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+You write custom CUDA kernels to replace the pytorch operators in the given architecture to get speedups.   
+  
+You have complete freedom to choose the set of operators you want to replace. You may make the decision to replace some operators with custom CUDA kernels and leave others unchanged. You may replace multiple operators with custom implementations, consider operator fusion opportunities (combining multiple operators into a single kernel, for example, combining matmul+relu), or algorithmic changes (such as online softmax). You are only limited by your imagination.  
+  
+Here's an example to show you the syntax of inline embedding custom CUDA operators in torch: The example given architecture is:   
+  
+python
+import torch
+import torch.nn as nn
+
+torch.backends.cuda.matmul.allow_tf32 = False
+
+class Model(nn.Module):
+    def __init__(self):
+        super(Model, self).__init__()
+
+    def forward(self, params: torch.Tensor, indices: torch.Tensor) -> torch.Tensor:
+       
+        b = indices[:, 0]
+        h = indices[:, 1]
+        w = indices[:, 2]
+        
+        return params[b, h, w]
+
+B, H, W, C = 4, 256, 256, 128
+N = 1024 * 1024 
+
+def get_inputs():
+    params = torch.randn(B, H, W, C, dtype=torch.float32).cuda()
+
+    idx_b = torch.randint(0, B, (N,)).cuda()
+    idx_h = torch.randint(0, H, (N,)).cuda()
+    idx_w = torch.randint(0, W, (N,)).cuda()
+    
+    indices = torch.stack([idx_b, idx_h, idx_w], dim=1).long() # [N, 3]
+    
+    return [params, indices]
+
+def get_init_inputs():
+    return []
+```

S1/ZZZJ_#199/run_code.py

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+###########################################################
+# 性能和精度验证程序
+###########################################################
+import torch
+import torch.nn as nn
+import time
+from gather_nd_torch import Model,get_inputs,get_init_inputs
+from gather_nd_cuda import ModelNew
+
+def run_benchmark():
+    # 检查 CUDA 是否可用
+    if not torch.cuda.is_available():
+        print("CUDA 不可用，请确保您有可用的 NVIDIA GPU 并已正确安装 PyTorch CUDA 版本。")
+        return
+    else:
+        device = torch.device("cuda")
+
+    # 初始化模型
+    init_inputs = get_init_inputs()
+    init_inputs = [
+        x.cuda(device=device) if isinstance(x, torch.Tensor) else x for x in init_inputs
+    ]
+    inputs = get_inputs()
+    inputs = [
+        x.cuda(device=device) if isinstance(x, torch.Tensor) else x for x in inputs
+    ]
+
+    torch_model = Model(*init_inputs).cuda()
+    cuda_model = ModelNew(*init_inputs).cuda()
+
+    torch_model.eval()
+    cuda_model.eval()
+
+    print("-------------------- 精度对齐验证 --------------------")
+    with torch.no_grad():
+        output_torch = torch_model( *inputs)
+        output_cuda = cuda_model(*inputs)
+
+    precision_flag = torch.allclose(output_torch, output_cuda,rtol=1e-03)
+    if precision_flag:
+        print("✅ 精度对齐：两个模型的输出结果非常接近。")
+    else:
+        print("❌ 精度不一致！")
+        
+    print("\n-------------------- 性能加速比测试 --------------------")
+    num_iterations = 100 
+    
+    # PyTorch 模型计时
+    torch.cuda.synchronize()
+    start_time = time.time()
+    for _ in range(num_iterations):
+        _ = torch_model(*inputs)
+    torch.cuda.synchronize()
+    torch_time = (time.time() - start_time) / num_iterations
+    
+    # 自定义 CUDA 内核计时
+    torch.cuda.synchronize()
+    start_time = time.time()
+    for _ in range(num_iterations):
+        _ = cuda_model(*inputs)
+    torch.cuda.synchronize()
+    cuda_time = (time.time() - start_time) / num_iterations
+    
+    print(f"PyTorch torch.relu 平均执行时间: {torch_time:.6f} 秒")
+    print(f"自定义 CUDA 内核 平均执行时间: {cuda_time:.6f} 秒")
+    speedup = 0
+    if cuda_time > 0:
+        speedup = torch_time / cuda_time
+        print(f"加速比 (Speedup): {speedup:.2f}x")
+    else:
+        print("CUDA 内核执行时间为0，无法计算加速比。")
+    return precision_flag,speedup
+if __name__ == "__main__":
+    precision_flag,speedup = run_benchmark()