forked from ccf-ai-infra/GPUCodeForces
128 lines
4.0 KiB
Python
128 lines
4.0 KiB
Python
import torch
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import torch.nn as nn
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from torch.utils.cpp_extension import load_inline
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class ModelNew(nn.Module):
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def __init__(self, num_features=64, init=0.25):
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super().__init__()
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self.num_features = num_features
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self.weight = nn.Parameter(torch.full((num_features,), init))
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self._compile_cuda_kernel()
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def _compile_cuda_kernel(self):
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cpp_source = """
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#include <torch/extension.h>
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torch::Tensor prelu_cuda(torch::Tensor x, torch::Tensor w);
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"""
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cuda_source = """
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#include <cuda_runtime.h>
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__global__ void prelu_channel_vec4(
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const float* __restrict__ x,
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float* __restrict__ y,
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const float* __restrict__ w,
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int total_vecs,
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int spatial_vecs, // spatial_size / 4
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int channels)
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{
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int idx = blockIdx.x * blockDim.x + threadIdx.x;
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int stride = gridDim.x * blockDim.x;
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const float4* x_vec = reinterpret_cast<const float4*>(x);
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float4* y_vec = reinterpret_cast<float4*>(y);
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for (int i = idx; i < total_vecs; i += stride) {
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float4 v = x_vec[i];
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float4 out;
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int c = (i / spatial_vecs) % channels;
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float slope = w[c];
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out.x = (v.x < 0.0f) ? (v.x * slope) : v.x;
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out.y = (v.y < 0.0f) ? (v.y * slope) : v.y;
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out.z = (v.z < 0.0f) ? (v.z * slope) : v.z;
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out.w = (v.w < 0.0f) ? (v.w * slope) : v.w;
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y_vec[i] = out;
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}
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}
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__global__ void prelu_scalar_kernel(
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const float* __restrict__ x,
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float* __restrict__ y,
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const float* __restrict__ w,
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int total_elements,
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int spatial_size,
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int channels)
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{
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int idx = blockIdx.x * blockDim.x + threadIdx.x;
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int stride = gridDim.x * blockDim.x;
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for (int i = idx; i < total_elements; i += stride) {
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int c = (i / spatial_size) % channels;
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float val = x[i];
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float slope = w[c];
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y[i] = (val < 0.0f) ? (val * slope) : val;
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}
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}
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torch::Tensor prelu_cuda(torch::Tensor x, torch::Tensor w) {
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auto x_c = x.contiguous();
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auto w_c = w.contiguous();
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auto output = torch::empty_like(x_c);
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int N = x_c.size(0);
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int C = x_c.size(1);
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int total_elements = x_c.numel();
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// Spatial size (H*W or L) = Total / (N*C)
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int S = total_elements / (N * C);
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if (S % 4 == 0) {
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int total_vecs = total_elements / 4;
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int spatial_vecs = S / 4;
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int threads = 256;
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int blocks = (total_vecs + threads - 1) / threads;
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if (blocks > 65535) blocks = 65535;
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prelu_channel_vec4<<<blocks, threads>>>(
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x_c.data_ptr<float>(),
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output.data_ptr<float>(),
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w_c.data_ptr<float>(),
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total_vecs,
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spatial_vecs,
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C
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);
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} else {
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int threads = 256;
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int blocks = (total_elements + threads - 1) / threads;
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if (blocks > 65535) blocks = 65535;
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prelu_scalar_kernel<<<blocks, threads>>>(
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x_c.data_ptr<float>(),
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output.data_ptr<float>(),
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w_c.data_ptr<float>(),
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total_elements,
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S,
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C
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);
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}
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return output;
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}
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"""
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self.op = load_inline(
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name="prelu_opt_v3_fix",
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cpp_sources=cpp_source,
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cuda_sources=cuda_source,
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functions=["prelu_cuda"],
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extra_cuda_cflags=["-O3", "--use_fast_math"],
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verbose=False
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)
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def forward(self, x):
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return self.op.prelu_cuda(x, self.weight) |