mml_without_parents: Auxiliary function to both mml_cpt and mml_cpt_fast
In kelvinyangli/mbmml: Learn Markov blankets using Minimum Message Length

This is an auxiliary function to both mml_cpt() and mml_cpt_fast(). It calculates the mml score of a node without any parents.

1 2	mml_without_parents(indexListPerNodePerValue, arities, sampleSize, targetIndex, alpha, statingPara = FALSE)

`indexListPerNodePerValue`	A list of stored indices for each value of each node. It is obtained by the function count_occurance().
`arities`	A vector of variable ariteis.
`sampleSize`	Sample size of a given data set.
`targetIndex`	Index of the target node.
`alpha`	A vector of concentration parameters for a Dirichlet distribution. Range is from zeor to positive infinity, length is equal to the arity of the target variable.
`statingPara`	If TRUE MML estimate of the parameters are also stated with extra 0.5log(pi*e/6) per parameter, otherwise 0.