ogical modality.
  merge_prob:       probability to merge neighbor clusters for the generation of modality-specific
                    clusters (same for both modalities)


Outputs:

  a dataframe with keys as follows

  &#39;true_cluster&#39;:   true cell clusters, a vector of length n

  &#39;data_a_full&#39;:    feature matrix of transcript without dropouts
  &#39;data_a_dropout&#39;: feature matrix of transcript with dropouts
  &#39;data_a_label&#39;:   cluster labels to generate transcript features af