Function sam3_mlp_forward

sam3.cpp:10511–10529

MLP forward: N layers with ReLU (except last), optional sigmoid on last

// MLP forward: N layers with ReLU (except last), optional sigmoid on last
static struct ggml_tensor* sam3_mlp_forward(
    struct ggml_context* ctx,
    struct ggml_tensor* x,
    struct ggml_tensor* const* weights,
    struct ggml_tensor* const* biases,
    int n_layers,
    bool sigmoid_output = false) {
    for (int i = 0; i < n_layers; ++i) {
        x = ggml_mul_mat(ctx, weights[i], x);
        x = ggml_add(ctx, x, biases[i]);
        if (i < n_layers - 1) {
            x = ggml_relu(ctx, x);
        }
    }
    if (sigmoid_output) {
        x = ggml_sigmoid(ctx, x);
    }
    return x;
}

// Full SAM mask decoder graph
// Inputs: