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80_Gemm_Max_Subtract_GELU • warp_aligned_gemm_base_edit_1

Level 2 • Task 80
import torch
import torch.nn as nn
import torch.nn.functional as F


def module_fn(
    x: torch.Tensor,
    max_dim: int,
    weight: torch.Tensor,
    bias: torch.Tensor,
) -> torch.Tensor:
    """
    Performs a GEMM, followed by a max operation, subtraction, and GELU activation.

    Args:
        x (torch.Tensor): Input tensor of shape (batch_size, in_features)
        max_dim (int): Dimension to perform max operation over
        weight (torch.Tensor): Weight matrix of shape (out_features, in_features)
        bias (torch.Tensor): Bias vector of shape (out_features)

    Returns:
        torch.Tensor: Output tensor of shape (batch_size, out_features)
    """
    x = F.linear(x, weight, bias)
    x = torch.max(x, dim=max_dim, keepdim=True).values
    x = x - x.mean(dim=1, keepdim=True)
    x = F.gelu(x)
    return x


class Model(nn.Module):
    """
    Model that performs a GEMM, followed by a max operation, subtraction, and GELU activation.
    """

    def __init__(self, in_features, out_features, max_dim):
        super(Model, self).__init__()
        gemm = nn.Linear(in_features, out_features)
        self.weight = nn.Parameter(gemm.weight)
        self.bias = nn.Parameter(gemm.bias)

    def forward(self, x, max_dim, fn=module_fn):
        return fn(x, max_dim, self.weight, self.bias)


batch_size = 128
in_features = 512
out_features = 1024
max_dim = 1


def get_inputs():
    return [torch.randn(batch_size, in_features), max_dim]


def get_init_inputs():
    return [in_features, out_features, max_dim]

import torch
import torch.nn as nn

class Model(nn.Module):
    """
    Model that performs a GEMM, followed by a max operation, subtraction, and GELU activation.
    """
    def __init__(self, in_features, out_features, max_dim):
        super(Model, self).__init__()
        self.gemm = nn.Linear(in_features, out_features)
        self.max_dim = max_dim

    def forward(self, x):
        """
        Args:
            x: Input tensor of shape (batch_size, in_features)

        Returns:
            Output tensor of shape (batch_size, out_features)
        """
        x = self.gemm(x)
        x = torch.max(x, dim=self.max_dim, keepdim=True).values
        x = x - x.mean(dim=1, keepdim=True)
        x = torch.nn.functional.gelu(x)
        return x

batch_size = 128
in_features = 512
out_features = 1024
max_dim = 1

def get_inputs():
    return [torch.randn(batch_size, in_features)]

def get_init_inputs():
    return [in_features, out_features, max_dim]
Download Evaluation Download PyTorch Download CUDA Download Profiles

Kernel Information

Operation Name 80_Gemm_Max_Subtract_GELU
Level ID 2
Task ID 80
Kernel Name warp_aligned_gemm_base_edit_1
CUDA Speedup (Native) 1.703x
CUDA Speedup (Compile) 1.809x
CUDA Runtime 0.025 ms
PyTorch Runtime (Native) 0.043 ms
PyTorch Runtime (Compile) 0.045 ms
Correct True
Max Diff (vs. Reference) 0.000000
Model bedrock/anthropic.claude-3-5-sonnet-20241022-v2:0
Temperature 0.00
View Experiment Progress Details

Related Kernels (Level 2, Task 80 • 80_Gemm_Max_Subtract_GELU)

Rank Kernel Name Runtime (ms) Speedup Native Speedup Compile
🥇 warp_optimized_gemm_max_gelu_base 0.03 1.70 1.81
🥇 warp_optimized_shared_memory_edit_1 0.03 1.70 1.81
🥇 warp_aligned_gemm_base_edit_1 0.03 1.70 1.81
🥇 warp_optimized_shared_memory_base 0.03 1.70 1.81
🥇 warp_balanced_gemm_optimization_base 0.03 1.70 1.81
6 warp_aligned_gemm_base_base 0.03 1.58 1.67
7 warp_aligned_gemm_const_bias_base 0.03 1.47 1.56
8 warp_aligned_gemm_const_bias_edit_1 0.03 1.25 1.33
8 ldg_memory_optimized_kernel_base 0.03 1.25 1.33
10 indexing_optimized_fused_kernel_base 0.04 1.22 1.29
10 workload_balanced_kernel_base_base 0.04 1.22 1.29
10 shared_memory_reduction_warp_optimization_base_base 0.04 1.22 1.29
10 efficient_thread_mapping_kernel_base 0.04 1.22 1.29
14 block_tuned_fused_kernel_base_base 0.04 1.18 1.26
14 minimal_sync_optimized_kernel_base_base 0.04 1.18 1.26
16 warp_balanced_gemm_optimization_edit_1 0.04 1.15 1.22
17 warp_optimized_reduction_base_base 0.04 1.09 1.16
18 evenly_distributed_base 0.04 1.06 1.13
18 fused_gemm_max_reduce_gelu_base 0.04 1.06 1.13
20 fused_stride_loops_base 0.04 1.04 1.10 
#include <torch/extension.h>
#include <cuda.h>
#include <cuda_runtime.h>
#include <math.h>
#include <float.h>

#define WARP_SIZE 32
#define BLOCK_SIZE 256
#define TILE_DIM 32  // Aligned with warp size

__device__ inline float gelu(float x) {
    // Fast GELU approximation using CUDA intrinsics
    const float a = 0.797884560802865f;
    const float b = 0.044715f;
    float cdf = 0.5f * (1.0f + tanhf(a * (x + b * x * x * x)));
    return x * cdf;
}

// Warp-aligned GEMM kernel
__global__ void warp_aligned_gemm_kernel(const float* __restrict__ x,
                                        const float* __restrict__ weight,
                                        const float* __restrict__ bias,
                                        float* __restrict__ y,
                                        int batch, int in_features, int out_features) {
    // Align with warp size for better occupancy
    __shared__ float tile_x[TILE_DIM][TILE_DIM];
    __shared__ float tile_w[TILE_DIM][TILE_DIM];

    const int warp_id = threadIdx.x / WARP_SIZE;
    const int lane_id = threadIdx.x % WARP_SIZE;
    
    const int row = blockIdx.y * TILE_DIM + warp_id;
    const int col = blockIdx.x * TILE_DIM + lane_id;
    
    float sum = 0.0f;

    // Process input in warp-aligned tiles
    for (int t = 0; t < (in_features + TILE_DIM - 1) / TILE_DIM; t++) {
        const int tile_x_col = t * TILE_DIM + lane_id;
        const int tile_w_row = t * TILE_DIM + warp_id;
        
        // Collaborative loading using all threads in warp
        if (row < batch && tile_x_col < in_features) {
            tile_x[warp_id][lane_id] = x[row * in_features + tile_x_col];
        }
        if (col < out_features && tile_w_row < in_features) {
            tile_w[warp_id][lane_id] = weight[col * in_features + tile_w_row];
        }
        
        __syncthreads();

        // Compute partial products
        #pragma unroll
        for (int k = 0; k < TILE_DIM; k++) {
            sum += tile_x[warp_id][k] * tile_w[k][lane_id];
        }
        
        __syncthreads();
    }

    // Write result with uniform control flow
    if (row < batch && col < out_features) {
        y[row * out_features + col] = sum + bias[col];
    }
}

// Warp-synchronized max reduction kernel
__global__ void warp_reduce_max_kernel(const float* __restrict__ input,
                                      float* __restrict__ output,
                                      int rows, int cols, int reduce_dim) {
    __shared__ float shared_data[BLOCK_SIZE];
    
    const int tid = threadIdx.x;
    const int lane_id = tid % WARP_SIZE;
    const int warp_id = tid / WARP_SIZE;
    
    float max_val = -FLT_MAX;
    
    if (reduce_dim == 0) {
        // Reduce along rows (batch dimension)
        const int col = blockIdx.x * WARP_SIZE + lane_id;
        if (col < cols) {
            for (int row = 0; row < rows; row += BLOCK_SIZE) {
                if (row + tid < rows) {
                    max_val = fmaxf(max_val, input[(row + tid) * cols + col]);
                }
            }
        }
    } else {
        // Reduce along columns (feature dimension)
        const int row = blockIdx.x;
        for (int col = tid; col < cols; col += BLOCK_SIZE) {
            if (col < cols) {
                max_val = fmaxf(max_val, input[row * cols + col]);
            }
        }
    }
    
    shared_data[tid] = max_val;
    __syncthreads();
    
    // Warp-synchronized reduction
    if (tid < WARP_SIZE) {
        #pragma unroll
        for (int offset = WARP_SIZE/2; offset > 0; offset /= 2) {
            max_val = fmaxf(max_val, __shfl_down_sync(0xffffffff, max_val, offset));
        }
        
        if (lane_id == 0) {
            if (reduce_dim == 0) {
                output[blockIdx.x * WARP_SIZE + warp_id] = max_val;
            } else if (warp_id == 0) {
                output[blockIdx.x] = max_val;
            }
        }
    }
}

// Fused mean-subtract-GELU kernel with warp-level operations
__global__ void warp_fused_mean_gelu_kernel(float* __restrict__ data,
                                           int rows, int cols) {
    __shared__ float warp_sums[WARP_SIZE];
    
    const int row = blockIdx.x;
    const int tid = threadIdx.x;
    const int lane_id = tid % WARP_SIZE;
    const int warp_id = tid / WARP_SIZE;
    
    float sum = 0.0f;
    
    // Compute sum using warp-level reduction
    for (int col = tid; col < cols; col += blockDim.x) {
        sum += data[row * cols + col];
    }
    
    // Warp-synchronized reduction for mean computation
    #pragma unroll
    for (int offset = WARP_SIZE/2; offset > 0; offset /= 2) {
        sum += __shfl_down_sync(0xffffffff, sum, offset);
    }
    
    if (lane_id == 0) {
        warp_sums[warp_id] = sum;
    }
    __syncthreads();
    
    // Final reduction and mean computation
    if (tid == 0) {
        float total_sum = 0.0f;
        for (int i = 0; i < (blockDim.x + WARP_SIZE - 1) / WARP_SIZE; i++) {
            total_sum += warp_sums[i];
        }
        warp_sums[0] = total_sum / cols;  // Store mean
    }
    __syncthreads();
    
    // Apply mean subtraction and GELU with minimal divergence
    const float mean = warp_sums[0];
    for (int col = tid; col < cols; col += blockDim.x) {
        float val = data[row * cols + col] - mean;
        data[row * cols + col] = gelu(val);
    }
}

torch::Tensor forward(torch::Tensor x, int max_dim, torch::Tensor weight, torch::Tensor bias) {
    const int batch = x.size(0);
    const int in_features = x.size(1);
    const int out_features = weight.size(0);

    auto y = torch::empty({batch, out_features}, x.options());
    
    // Launch warp-aligned GEMM
    dim3 block(BLOCK_SIZE);
    dim3 grid((out_features + TILE_DIM - 1) / TILE_DIM,
              (batch + TILE_DIM - 1) / TILE_DIM);
    
    warp_aligned_gemm_kernel<<<grid, block>>>(
        x.data_ptr<float>(), weight.data_ptr<float>(),
        bias.data_ptr<float>(), y.data_ptr<float>(),
        batch, in_features, out_features);

    // Perform max reduction
    auto max_out = (max_dim == 0) ?
        torch::empty({1, out_features}, y.options()) :
        torch::empty({batch, 1}, y.options());
    
    const int rows = (max_dim == 0) ? batch : 1;
    const int cols = (max_dim == 0) ? out_features : batch;
    
    dim3 reduce_grid((cols + WARP_SIZE - 1) / WARP_SIZE);
    warp_reduce_max_kernel<<<reduce_grid, BLOCK_SIZE>>>(
        y.data_ptr<float>(), max_out.data_ptr<float>(),
        batch, out_features, max_dim);

    // Apply fused mean-subtract-GELU
    const int final_rows = max_out.size(0);
    const int final_cols = max_out.size(1);
    
    warp_fused_mean_gelu_kernel<<<final_rows, BLOCK_SIZE>>>(
        max_out.data_ptr<float>(), final_rows, final_cols);

    return max_out;
}

PYBIND11_MODULE(TORCH_EXTENSION_NAME, m) {
    m.def("forward", &forward, "Warp-aligned CUDA forward implementation");
}
Performance Metrics
Metric Value Unit Variance Samples
Executed Ipc Active 0.168 inst/cycle 0.000 5
Executed Ipc Elapsed 0.060 inst/cycle 0.000 5
Issue Slots Busy 4.464 % 0.007 5
Issued Ipc Active 0.178 inst/cycle 0.000 5
SM Busy 4.464 % 0.007 5
Memory Throughput 2462726298.692 byte/second 3490496661750123520.000 5
Mem Busy 8.878 % 0.103 5
Max Bandwidth 4.578 % 0.032 5
L1/TEX Hit Rate 66.670 % 0.000 5
L2 Hit Rate 102.370 % 1.223 5
Mem Pipes Busy 2.432 % 0.008 5
Warp Cycles Per Issued Instruction 39.172 cycle 0.263 5
Warp Cycles Per Executed Instruction 41.196 cycle 0.292 5
Avg. Active Threads Per Warp 24.080 0.000 5
Avg. Not Predicated Off Threads Per Warp 18.660 0.000 5
Max Active Clusters 0.000 cluster 0.000 5
Max Cluster Size 8.000 block 0.000 5
Overall GPU Occupancy 0.000 % 0.000 5
Cluster Occupancy 0.000 % 0.000 5
Block Limit SM 32.000 block 0.000 5
Block Limit Registers 10.000 block 0.000 5
Block Limit Shared Mem 28.000 block 0.000 5
Block Limit Warps 8.000 block 0.000 5
Theoretical Active Warps per SM 64.000 warp 0.000 5
Theoretical Occupancy 100.000 % 0.000 5
Achieved Occupancy 11.016 % 0.001 5
Achieved Active Warps Per SM 7.050 warp 0.000 5
Analysis Rules
Rule Description
WRN HighPipeUtilization All compute pipelines are under-utilized. Either this kernel is very small or it doesn't issue enough warps per scheduler. Check the Launch Statistics and Scheduler Statistics sections for further details.
INF CPIStall Check the Warp Stall Sampling (All Cycles) table for the top stall locations in your source based on sampling data. The Kernel Profiling Guide (https://docs.nvidia.com/nsight-compute/ProfilingGuide/index.html#metrics-reference) provides more details on each stall reason.
WRN ThreadDivergence Instructions are executed in warps, which are groups of 32 threads. Optimal instruction throughput is achieved if all 32 threads of a warp execute the same instruction. The chosen launch configuration, early thread completion, and divergent flow control can significantly lower the number of active threads in a warp per cycle. This kernel achieves an average of 24.1 threads being active per cycle. This is further reduced to 18.7 threads per warp due to predication. The compiler may use predication to avoid an actual branch. Instead, all instructions are scheduled, but a per-thread condition code or predicate controls which threads execute the instructions. Try to avoid different execution paths within a warp when possible. In addition, ensure your kernel makes use of Independent Thread Scheduling, which allows a warp to reconverge after a data-dependent conditional block by explicitly calling __syncwarp().
WRN Occupancy This kernel's theoretical occupancy is not impacted by any block limit. The difference between calculated theoretical (100.0%) and measured achieved occupancy (11.0%) can be the result of warp scheduling overheads or workload imbalances during the kernel execution. Load imbalances can occur between warps within a block as well as across blocks of the same kernel. See the CUDA Best Practices Guide (https://docs.nvidia.com/cuda/cuda-c-best-practices-guide/index.html#occupancy) for more details on optimizing occupancy.
Operation / Metric Value Unit
aten::to
CPU Time 186368.19 μs
Device Time 148.93 μs
Self CPU Time 59.02 μs
Self Device Time 0.00 μs
CPU Memory Usage 0 B
Device Memory Usage 0 B
Self CPU Memory Usage 0 B
Self Device Memory Usage 0 B
aten::_to_copy
CPU Time 186309.17 μs
Device Time 148.93 μs
Self CPU Time 110.30 μs
Self Device Time 0.00 μs
CPU Memory Usage 0 B
Device Memory Usage 0 B
Self CPU Memory Usage 0 B
Self Device Memory Usage 0 B
aten::empty_strided
CPU Time 185756.67 μs
Device Time 0.00 μs
Self CPU Time 111.30 μs
Self Device Time 0.00 μs
CPU Memory Usage 0 B
Device Memory Usage 0 B
Self CPU Memory Usage 0 B
Self Device Memory Usage 0 B
cudaDeviceGetStreamPriorityRange
CPU Time 185231.17 μs
Device Time 0.00 μs
Self CPU Time 185231.17 μs
Self Device Time 0.00 μs
CPU Memory Usage 0 B
Device Memory Usage 0 B
Self CPU Memory Usage 0 B
Self Device Memory Usage 0 B
cudaLaunchKernel
CPU Time 552846.62 μs
Device Time 25725.40 μs
Self CPU Time 552846.62 μs
Self Device Time 25725.40 μs
CPU Memory Usage 0 B
Device Memory Usage 0 B
Self CPU Memory Usage 0 B
Self Device Memory Usage 0 B
warp_aligned_gemm_kernel(float const*, float const*, float const*, float*, int, int, int)
CPU Time 0.00 μs
Device Time 118917.57 μs
Self CPU Time 0.00 μs
Self Device Time 118917.57 μs
CPU Memory Usage 0 B
Device Memory Usage 0 B
Self CPU Memory Usage 0 B
Self Device Memory Usage 0 B
aten::zero_
CPU Time 57556.87 μs
Device Time 572828.50 μs
Self CPU Time 11744.20 μs
Self Device Time 0.00 μs
CPU Memory Usage 0 B
Device Memory Usage 0 B
Self CPU Memory Usage 0 B
Self Device Memory Usage 0 B
aten::fill_
CPU Time 45814.59 μs
Device Time 572828.50 μs
Self CPU Time 14808.02 μs
Self Device Time 572828.50 μs
CPU Memory Usage 0 B
Device Memory Usage 0 B
Self CPU Memory Usage 0 B
Self Device Memory Usage 0 B
void at::native::vectorized_elementwise_kernel<4, at::native::FillFunctor<int>, at::detail::Array<char*, 1> >(int, at::native::FillFunctor<int>, at::detail::Array<char*, 1>)
CPU Time 0.00 μs
Device Time 572828.50 μs
Self CPU Time 0.00 μs
Self Device Time 572828.50 μs
CPU Memory Usage 0 B
Device Memory Usage 0 B
Self CPU Memory Usage 0 B
Self Device Memory Usage 0 B
Status: Completed 
45301 warnings generated when compiling for host.
Suppressed 45324 warnings (45277 in non-user code, 47 NOLINT).
Use -header-filter=.* to display errors from all non-system headers. Use -system-headers to display errors from system headers as well.
/home/robert_sakana_ai/llm_cuda/experiments/20250208_optimize_b5_s4_e1_sweep/level_2/task_80/b2_s3_warp_aligned_gemm_base/edit_1/edit_1.cu:20:42 bugprone-easily-swappable-parameters
20 | __global__ void warp_aligned_gemm_kernel(const float* __restrict__ x,
| ^~~~~~~~~~~~~~~~~~~~~~~~~~~~
21 | const float* __restrict__ weight,
| ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
22 | const float* __restrict__ bias,
| ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
/home/robert_sakana_ai/llm_cuda/experiments/20250208_optimize_b5_s4_e1_sweep/level_2/task_80/b2_s3_warp_aligned_gemm_base/edit_1/edit_1.cu:20:68: note: the first parameter in the range is 'x'
20 | __global__ void warp_aligned_gemm_kernel(const float* __restrict__ x,
| ^
/home/robert_sakana_ai/llm_cuda/experiments/20250208_optimize_b5_s4_e1_sweep/level_2/task_80/b2_s3_warp_aligned_gemm_base/edit_1/edit_1.cu:22:67: note: the last parameter in the range is 'bias'
22 | const float* __restrict__ bias,
| ^~~~
/home/robert_sakana_ai/llm_cuda/experiments/20250208_optimize_b5_s4_e1_sweep/level_2/task_80/b2_s3_warp_aligned_gemm_base/edit_1/edit_1.cu:29:25: warning: narrowing conversion from 'unsigned int' to signed type 'int' is implementation-defined [bugprone-narrowing-conversions]
29 | const int warp_id = threadIdx.x / WARP_SIZE;
| ^
/home/robert_sakana_ai/llm_cuda/experiments/20250208_optimize_b5_s4_e1_sweep/level_2/task_80/b2_s3_warp_aligned_gemm_base/edit_1/edit_1.cu:30:25: warning: narrowing conversion from 'unsigned int' to signed type 'int' is implementation-defined [bugprone-narrowing-conversions]
30 | const int lane_id = threadIdx.x % WARP_SIZE;
| ^
/home/robert_sakana_ai/llm_cuda/experiments/20250208_optimize_b5_s4_e1_sweep/level_2/task_80/b2_s3_warp_aligned_gemm_base/edit_1/edit_1.cu:32:21: warning: narrowing conversion from 'unsigned int' to signed type 'int' is implementation-defined [bugprone-narrowing-conversions]
32 | const int row = blockIdx.y * TILE_DIM + warp_id;
| ^
/home/robert_sakana_ai/llm_cuda/experiments/20250208_optimize_b5_s4_e1_sweep/level_2/task_80/b2_s3_warp_aligned_gemm_base/edit_1/edit_1.cu:33:21: warning: narrowing conversion from 'unsigned int' to signed type 'int' is implementation-defined [bugprone-narrowing-conversions]
33 | const int col = blockIdx.x * TILE_DIM + lane_id;
| ^
/home/robert_sakana_ai/llm_cuda/experiments/20250208_optimize_b5_s4_e1_sweep/level_2/task_80/b2_s3_warp_aligned_gemm_base/edit_1/edit_1.cu:70:39: warning: 3 adjacent parameters of 'warp_reduce_max_kernel' of similar type ('int') are easily swapped by mistake [bugprone-easily-swappable-parameters]
70 | int rows, int cols, int reduce_dim) {
| ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
/home/robert_sakana_ai/llm_cuda/experiments/20250208_optimize_b5_s4_e1_sweep/level_2/task_80/b2_s3_warp_aligned_gemm_base/edit_1/edit_1.cu:70:43: note: the first parameter in the range is 'rows'
70 | int rows, int cols, int reduce_dim) {
| ^~~~
/home/robert_sakana_ai/llm_cuda/experiments/20250208_optimize_b5_s4_e1_sweep/level_2/task_80/b2_s3_warp_aligned_gemm_base/edit_1/edit_1.cu:70:63: note: the last parameter in the range is 'reduce_dim'
70 | int rows, int cols, int reduce_dim) {
| ^~~~~~~~~~
/home/robert_sakana_ai/llm_cuda/experiments/20250208_optimize_b5_s4_e1_sweep/level_2/task_80/b2_s3_warp_aligned_gemm_base/edit_1/edit_1.cu:73:21: warning: narrowing conversion from 'unsigned int' to signed type 'int' is implementation-defined [bugprone-narrowing-conversions]
73 | const int tid = threadIdx.x;
| ^
/home/robert_sakana_ai/llm_cuda/experiments/20250208_optimize_b5_s4_e1_sweep/level_2/task_80/b2_s3_warp_aligned_gemm_base/edit_1/edit_1.cu:81:25: warning: narrowing conversion from 'unsigned int' to signed type 'int' is implementation-defined [bugprone-narrowing-conversions]
81 | const int col = blockIdx.x * WARP_SIZE + lane_id;
| ^
/home/robert_sakana_ai/llm_cuda/experiments/20250208_optimize_b5_s4_e1_sweep/level_2/task_80/b2_s3_warp_aligned_gemm_base/edit_1/edit_1.cu:91:25: warning: narrowing conversion from 'unsigned int' to signed type 'int' is implementation-defined [bugprone-narrowing-conversions]
91 | const int row = blockIdx.x;
| ^
/home/robert_sakana_ai/llm_cuda/experiments/20250208_optimize_b5_s4_e1_sweep/level_2/task_80/b2_s3_warp_aligned_gemm_base/edit_1/edit_1.cu:121:44: warning: 2 adjacent parameters of 'warp_fused_mean_gelu_kernel' of similar type ('int') are easily swapped by mistake [bugprone-easily-swappable-parameters]
121 | int rows, int cols) {
| ^~~~~~~~~~~~~~~~~~
/home/robert_sakana_ai/llm_cuda/experiments/20250208_optimize_b5_s4_e1_sweep/level_2/task_80/b2_s3_warp_aligned_gemm_base/edit_1/edit_1.cu:121:48: note: the first parameter in the range is 'rows'
121 | int rows, int cols) {
| ^~~~
/home/robert_sakana_ai/llm_cuda/experiments/20250208_optimize_b5_s4_e1_sweep/level_2/task_80/b2_s3_warp_aligned_gemm_base/edit_1/edit_1.cu:121:58: note: the last parameter in the range is 'cols'
121 | int rows, int cols) {
| ^~~~
/home/robert_sakana_ai/llm_cuda/experiments/20250208_optimize_b5_s4_e1_sweep/level_2/task_80/b2_s3_warp_aligned_gemm_base/edit_1/edit_1.cu:124:21: warning: narrowing conversion from 'unsigned int' to signed type 'int' is implementation-defined [bugprone-narrowing-conversions]
124 | const int row = blockIdx.x;
| ^
/home/robert_sakana_ai/llm_cuda/experiments/20250208_optimize_b5_s4_e1_sweep/level_2/task_80/b2_s3_warp_aligned_gemm_base/edit_1/edit_1.cu:125:21: warning: narrowing conversion from 'unsigned int' to signed type 'int' is implementation-defined [bugprone-narrowing-conversions]
125 | const int tid = threadIdx.x;
| ^
/home/robert_sakana_ai/llm_cuda/experiments/20250208_optimize_b5_s4_e1_sweep/level_2/task_80/b2_s3_warp_aligned_gemm_base/edit_1/edit_1.cu:132:44: warning: narrowing conversion from 'unsigned int' to signed type 'int' is implementation-defined [bugprone-narrowing-conversions]
132 | for (int col = tid; col < cols; col += blockDim.x) {
| ^
/home/robert_sakana_ai/llm_cuda/experiments/20250208_optimize_b5_s4_e1_sweep/level_2/task_80/b2_s3_warp_aligned_gemm_base/edit_1/edit_1.cu:153:36: warning: narrowing conversion from 'int' to 'float' [bugprone-narrowing-conversions]
153 | warp_sums[0] = total_sum / cols; // Store mean
| ^
/home/robert_sakana_ai/llm_cuda/experiments/20250208_optimize_b5_s4_e1_sweep/level_2/task_80/b2_s3_warp_aligned_gemm_base/edit_1/edit_1.cu:159:44: warning: narrowing conversion from 'unsigned int' to signed type 'int' is implementation-defined [bugprone-narrowing-conversions]
159 | for (int col = tid; col < cols; col += blockDim.x) {
| ^
/home/robert_sakana_ai/llm_cuda/experiments/20250208_optimize_b5_s4_e1_sweep/level_2/task_80/b2_s3_warp_aligned_gemm_base/edit_1/edit_1.cu:165:37: warning: the parameter 'x' is copied for each invocation but only used as a const reference; consider making it a const reference [performance-unnecessary-value-param]
165 | torch::Tensor forward(torch::Tensor x, int max_dim, torch::Tensor weight, torch::Tensor bias) {
| ^
| const &
/home/robert_sakana_ai/llm_cuda/experiments/20250208_optimize_b5_s4_e1_sweep/level_2/task_80/b2_s3_warp_aligned_gemm_base/edit_1/edit_1.cu:165:67: warning: the parameter 'weight' is copied for each invocation but only used as a const reference; consider making it a const reference [performance-unnecessary-value-param]
165 | torch::Tensor forward(torch::Tensor x, int max_dim, torch::Tensor weight, torch::Tensor bias) {
| ^
| const &
/home/robert_sakana_ai/llm_cuda/experiments/20250208_optimize_b5_s4_e1_sweep/level_2/task_80/b2_s3_warp_aligned_gemm_base/edit_1/edit_1.cu:165:89: warning: the parameter 'bias' is copied for each invocation but only used as a const reference; consider making it a const reference [performance-unnecessary-value-param]
165 | torch::Tensor forward(torch::Tensor x, int max_dim, torch::Tensor weight, torch::Tensor bias) {
| ^
| const &
/home/robert_sakana_ai/llm_cuda/experiments/20250208_optimize_b5_s4_e1_sweep/level_2/task_80/b2_s3_warp_aligned_gemm_base/edit_1/edit_1.cu:166:23: warning: narrowing conversion from 'int64_t' (aka 'long') to signed type 'int' is implementation-defined [bugprone-narrowing-conversions]
166 | const int batch = x.size(0);
| ^
/home/robert_sakana_ai/llm_cuda/experiments/20250208_optimize_b5_s4_e1_sweep/level_2/task_80/b2_s3_warp_aligned_gemm_base/edit_1/edit_1.cu:167:29: warning: narrowing conversion from 'int64_t' (aka 'long') to signed type 'int' is implementation-defined [bugprone-narrowing-conversions]
167 | const int in_features = x.size(1);
| ^
/home/robert_sakana_ai/llm_cuda/experiments/20250208_optimize_b5_s4_e1_sweep/level_2/task_80/b2_s3_warp_aligned_gemm_base/edit_1/edit_1.cu:168:30: warning: narrowing conversion from 'int64_t' (aka 'long') to signed type 'int' is implementation-defined [bugprone-narrowing-conversions]
168 | const int out_features = weight.size(0);
| ^
/home/robert_sakana_ai/llm_cuda/experiments/20250208_optimize_b5_s4_e1_sweep/level_2/task_80/b2_s3_warp_aligned_gemm_base/edit_1/edit_1.cu:187:15: warning: Value stored to 'rows' during its initialization is never read [clang-analyzer-deadcode.DeadStores]
187 | const int rows = (max_dim == 0) ? batch : 1;
| ^~~~ ~~~~~~~~~~~~~~~~~~~~~~~~~~
/home/robert_sakana_ai/llm_cuda/experiments/20250208_optimize_b5_s4_e1_sweep/level_2/task_80/b2_s3_warp_aligned_gemm_base/edit_1/edit_1.cu:187:15: note: Value stored to 'rows' during its initialization is never read
187 | const int rows = (max_dim == 0) ? batch : 1;
| ^~~~ ~~~~~~~~~~~~~~~~~~~~~~~~~~
/home/robert_sakana_ai/llm_cuda/experiments/20250208_optimize_b5_s4_e1_sweep/level_2/task_80/b2_s3_warp_aligned_gemm_base/edit_1/edit_1.cu:196:28: warning: narrowing conversion from 'int64_t' (aka 'long') to signed type 'int' is implementation-defined [bugprone-narrowing-conversions]
196 | const int final_rows = max_out.size(0);
| ^
/home/robert_sakana_ai/llm_cuda/experiments/20250208_optimize_b5_s4_e1_sweep/level_2/task_80/b2_s3_warp_aligned_gemm_base/edit_1/edit_1.cu:197:28: warning: narrowing conversion from 'int64_t' (aka 'long') to signed type 'int' is implementation-defined [bugprone-narrowing-conversions]
197 | const int final_cols = max_out.size(1);
| ^