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amd-mixture-of-experts · submission 23050

KernelBot user 25 · python · License unknown
Kernel source · 1 lines ↓

Use it

Vendorable · source mirrored · license unknownView source →

No package. Vendor the mirrored source: 1 lines, June 9 Researcher Reciprocity License v1.0.

template-moe.py
curl "https://kernelindex.com/api/v1/implementations/kernelbot-amd-mixture-of-experts-23050?include=source"
interfacepython
Compatibility
measured onAMD Instinct MI300X
declared hardwareAMD Instinct MI300X
architecturesgfx942
dtypesfp16

Benchmark evidence

2 measurements across 1 GPU, fastest first.

Operation / workload
Hardware
Latency
Rank
Observed
AMD DeepSeek-style MoE layerfp16 · [1, 2048, 7168]
AMD Instinct MI300X
6.20s
#97 of 118
2025-05-16
Run →
AMD DeepSeek-style MoE layerfp16 · [1, 8192, 7168]
AMD Instinct MI300X
6.22s
#98 of 118
2025-05-16
Run →

Reported · How evidence levels are derived →

Source and license

sourceavailable
revision digestsha256:330c413e692d9f05090594976d34d1b5df0c85f956c7a493006c207c7d6eea65
license declaredunknown
license concludedunknown
imported2026-08-15

Kernel source

template-moe.py1 lines
import torch
import torch.nn as nn
import torch.nn.functional as F
from typing import Dict, Tuple, Optional
import math

class Expert(nn.Module):
    def __init__(self, config: Dict, d_expert: Optional[int] = None):
        super().__init__()
        self.config = config
        self.act_fn = nn.SiLU()
        self.d_hidden: int = config["d_hidden"]
        self.d_expert: int = config["d_expert"] if d_expert is None else d_expert

        self.W_gate = nn.Linear(self.d_hidden, self.d_expert, bias=False)
        self.W_up = nn.Linear(self.d_hidden, self.d_expert, bias=False)
        self.W_down = nn.Linear(self.d_expert, self.d_hidden, bias=False)

    def forward(self, x: torch.Tensor) -> torch.Tensor:
        gate = self.act_fn(self.W_gate(x))
        up_hidden = self.W_up(x)
        out = self.W_down(gate * up_hidden)
        return out

class MoEGate(nn.Module):
    def __init__(self, config: Dict):
        super().__init__()
        self.top_k: int = config["n_experts_per_token"]
        self.num_experts: int = config["n_routed_experts"]
        self.d_hidden: int = config["d_hidden"]

        self.W_g = nn.Linear(self.d_hidden, self.num_experts, bias=False)

    def forward(self, x: torch.Tensor) -> Tuple[torch.Tensor, torch.Tensor, torch.Tensor]:
        logits = self.W_g(x)
        scores = F.softmax(logits, dim=-1)
        topk_scores, topk_indices = torch.topk(scores, k=self.top_k, dim=-1, sorted=False)
        return topk_indices, topk_scores, scores

class MoE(nn.Module):
    def __init__(self, config: Dict):
        super().__init__()
        self.config = config
        self.experts = nn.ModuleList([
            Expert(config) for _ in range(config["n_routed_experts"])
        ])
        self.gating_network = MoEGate(config)
        
        shared_expert_config = config.copy() 
        n_shared_experts = config.get("n_shared_experts", 1) 
        d_expert_shared = config["d_expert"] * n_shared_experts
        
        self.shared_expert = Expert(shared_expert_config, d_expert=d_expert_shared)
        
        self.aux_loss_weight = config.get("aux_loss_weight", 0.01)

    def forward(self, x: torch.Tensor) -> Tuple[torch.Tensor, Dict]:
        batch_size, seq_len, hidden_dim = x.shape
        orig_shape = x.shape

        shared_output = self.shared_expert(x)
        
        expert_indices, expert_scores, all_router_scores = self.gating_network(x)
        
        x_flat = x.view(-1, hidden_dim)
        flat_expert_indices = expert_indices.view(-1)
        flat_expert_weights = expert_scores.view(-1, 1)
        
        routed_output_flat = self.moe_infer(
            x_flat, flat_expert_indices, flat_expert_weights
        )
        
        routed_output = routed_output_flat.view(*orig_shape)
        final_output = routed_output + shared_output
        
        aux_data = self.compute_aux_losses(all_router_scores, expert_indices)
        
        return final_output, aux_data

    @torch.no_grad()
    def moe_infer(self, x: torch.Tensor, flat_expert_indices: torch.Tensor,
                 flat_expert_weights: torch.Tensor) -> torch.Tensor:
        expert_cache = torch.zeros_like(x)
        
        idxs = flat_expert_indices.argsort()
        counts = flat_expert_indices.bincount(minlength=self.config["n_routed_experts"]).cpu().numpy()
        tokens_per_expert_cumsum = counts.cumsum()

        num_per_tok = self.config["n_experts_per_token"]
        token_idxs_for_sorted_assignments = idxs // num_per_tok

        for expert_id, end_idx_in_sorted_list in enumerate(tokens_per_expert_cumsum):
            start_idx_in_sorted_list = 0 if expert_id == 0 else tokens_per_expert_cumsum[expert_id - 1]
            if start_idx_in_sorted_list == end_idx_in_sorted_list:
                continue

            expert = self.experts[expert_id]
            current_expert_original_token_indices = token_idxs_for_sorted_assignments[start_idx_in_sorted_list:end_idx_in_sorted_list]
            expert_tokens_input = x[current_expert_original_token_indices]
            expert_tokens_output = expert(expert_tokens_input)
            
            weights_for_current_assignments = flat_expert_weights[idxs[start_idx_in_sorted_list:end_idx_in_sorted_list]]
            expert_tokens_output.mul_(weights_for_current_assignments)
            
            expert_cache.scatter_reduce_(
                0, 
                current_expert_original_token_indices.view(-1, 1).repeat(1, x.shape[-1]),
                expert_tokens_output,
                reduce='sum',
                include_self=True 
            )
        return expert_cache

    def compute_aux_losses(self, router_probs_all_experts: torch.Tensor, 
                         topk_expert_indices: torch.Tensor) -> Dict:
        num_experts = self.config["n_routed_experts"]
        
        topk_expert_indices_flat = topk_expert_indices.view(-1)
        counts = torch.bincount(topk_expert_indices_flat, minlength=num_experts).float()
        total_assignments = topk_expert_indices.numel() 
        fraction_assignments_per_expert = counts / total_assignments
        load_balance_loss = num_experts * torch.sum(fraction_assignments_per_expert.pow(2)) - 1.0 

        z_loss = (router_probs_all_experts.pow(2)).mean()
        total_aux_loss = self.aux_loss_weight * (load_balance_loss + z_loss)
        
        return {
            "router_probs": router_probs_all_experts,
            "load_balance_loss": load_balance_loss,
            "z_loss": z_loss,
            "total_aux_loss": total_aux_loss
        }

def custom_kernel(data: Tuple[torch.Tensor, Dict[str, torch.Tensor], Dict]) -> torch.Tensor:
    input_tensor, weights, config = data
    num_experts = config["n_routed_experts"]
    
    input_tensor = input_tensor.to(dtype=torch.float16)
    
    moe_module = MoE(config)
    
    moe_module.gating_network.W_g.weight = nn.Parameter(weights['router.weight'].to(dtype=torch.float16))
    
    for i in range(num_experts):
        gate_weight_t = weights[f'experts.{i}.0.weight'].t().to(dtype=torch.float16)
        up_weight_t = weights[f'experts.{i}.1.weight'].t().to(dtype=torch.float16)
        down_weight_t = weights[f'experts.{i}.2.weight'].t().to(dtype=torch.float16)
        
        moe_module.experts[i].W_gate.weight = nn.Parameter(gate_weight_t)
        moe_module.experts[i].W_up.weight = nn.Parameter(up_weight_t)
        moe_module.experts[i].W_down.weight = nn.Parameter(down_weight_t)
    
    moe_module.shared_expert.W_gate.weight = nn.Parameter(weights['shared_experts.0.weight'].t().to(dtype=torch.float16))
    moe_module.shared_expert.W_up.weight = nn.Parameter(weights['shared_experts.1.weight'].t().to(dtype=torch.float16))
    moe_module.shared_expert.W_down.weight = nn.Parameter(weights['shared_experts.2.weight'].t().to(dtype=torch.float16))
    
    moe_module = moe_module.to(device='cuda', dtype=torch.float16)
    
    output_tensor, _ = moe_module(input_tensor) 
    
    return output_tensor

Source code from GPU Mode and the KernelBot dataset · June 9 Researcher Reciprocity License v1.0

Best evidence level for this revision: reported

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