Method calc_magnitude

subprojects/llama.cpp/src/models/gemma3n-iswa.cpp:234–236

}

ggml_tensor * llm_build_gemma3n_iswa::calc_magnitude(ggml_tensor * x) {
    return ggml_sqrt(ctx0, ggml_sum_rows(ctx0, ggml_sqr(ctx0, x)));
}

// get 2D slice view from a 3D tensor, the idx corresponds to the 3rd dim
ggml_tensor * llm_build_gemma3n_iswa::view_2d_slice(ggml_tensor * x, int idx) {