the paper to improve clarity

Experiment Details: Figure 3 shows the general architecture of FQF. 'inefficient hyperparameter' we mean the atom locations (uniformly distributed between -10 and 10) in C51, quantiles FQF requires only the number of quantiles. We leave the theoretical analysis and comparison between IQN and FQF to future work. We will check if we can figure out why and explain it in detail. As shown in our toy case, FQF does achieve better distribution approximation.