             dimension of features for transcript modality.
  d_2:              dimension of features for morphological modality.
  k:                dimension of latent code to generate simulate data (for both modality)
  sigma_1:          variance of gaussian noise for transcript modality.
  sigma_2:          variance of gaussian noise for morphological modality.
  decay_coef_1:     decay coefficient of dropout rate for transcript modality.
  decay_coef_2:     decay coefficient of dropout rate for morphol