%>%                     re-export magrittr pipe operator
ensg_hgnc               A reference data frame that matches ENSG IDs to
                        HGNC symbols
get_data_from_sce       Access data from SCE object
get_hippo               Access hippo object from SingleCellExperiment
                        object.
get_hippo_diffexp       Return hippo_diffexp object
hippo                   HIPPO's hierarchical clustering
hippo_diagnostic_plot   Conduct feature selection by computing test
                        statistics for each gene
hippo_diffexp           HIPPO's differential expression
hippo_dimension_reduction
                        compute t-SNE or umap of each round of HIPPO
hippo_feature_heatmap   HIPPO's feature heatmap
hippo_pca_plot          visualize each round of hippo through t-SNE
hippo_tsne_plot         visualize each round of hippo through t-SNE
hippo_umap_plot         visualize each round of hippo through UMAP
nb_prob_zero            Expected zero proportion under Negative
                        Binomial
pois_prob_zero          Expected zero proportion under Poisson
preprocess_heterogeneous
                        Preprocess UMI data without cell label so that
                        each row contains information about each gene
preprocess_homogeneous
                        Preprocess UMI data with inferred or known
                        labels
toydata                 A sample single cell sequencing data subsetted
                        from Zheng2017
zero_proportion_plot    visualize each round of hippo through zero
                        proportion plot
zinb_prob_zero          Expected zero proportion under Negative
                        Binomial
