message: Improve accuracy of ELU kernel in TensorFlow Lite
  Avoid catastrophic cancellation for small negative inputs.
diff: @@ -179,7 +179,7 @@ inline void Elu(const RuntimeShape& input_shape, const float* input_data,
  const int flat_size = MatchingFlatSize(input_shape, output_shape);
  for (int i = 0; i < flat_size; ++i) {
  const float val = input_data[i];
  - output_data[i] = val < 0.0 ? std::exp(val) - 1 : val;
  + output_data[i] = val < 0.0f ? std::expm1(val) : val;
  }
  }
  