import torch
import torch.nn as nn

class GatingNetwork(nn.Module):
    def __init__(self, input_dim, num_experts):
        super(GatingNetwork, self).__init__()
        self.fc1 = nn.Linear(input_dim, 128)
        self.fc2 = nn.Linear(128, num_experts)
    
    def forward(self, x):
        x = torch.relu(self.fc1(x))
        x = torch.softmax(self.fc2(x), dim=1)
        return x