run_par_fs: The inner loop of corgi
In YutongWangUMich/corgi: CORGI: Curve-fit Objective Ranking of Gene Importance.

The inner loop of corgi

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run_par_fs(X, Y, run_time, fs, genes_use = NULL, must_have_genes = c(),
  n_genes_sample = NULL, n_cells_X_sample = NULL,
  n_cells_Y_sample = NULL, n_cores_use = NULL)

`X`	gene-by-cell expression matrix for batch 1
`Y`	gene-by-cell expression matrix for batch 2
`run_time`	how long to run for
`fs`	a list of scoring functions f(X[F, ], Y[F, ]) -> real number
`must_have_genes`	the set of marker genes that is used in every sampled gene set
`n_genes_sample`	what size gene set to use
`n_cells_X_sample`	how many cells to sample from X
`n_cells_Y_sample`	how many cells to sample from Y
`fs_var`	global variables, to save time
`gene_use`	the set of genes used for sampling