bioin.motif.normalize_probability

bioin.motif.normalize_probability(probabilities)

Rescale a collection of probabilityes so that they sum up to 1.

Parameters:probabilities (dict) – a dictionary of Probabilities, where keys are k-mers and values are the probabilities of these k-mers (which do no necessarily sum up to 1). Returns:Dictionary, a normalized dictionary where the probability of each k-mer was divided by the sun of all k-mers’ probabilities.

Examples

To rescale a collection of probabilities (the sides of the die) so that these probabilities sum to 1, we will write a function called Normalize(Probabilities). This function takes a dictionary Probabilities whose keys are k-mers and whose values are the probabilities of these k-mers (which do not necessarily sum to 1). The function should divide each value in Probabilities by the sum of all values in Probabilities, then return the resulting dictionary.

>>> probabilities = {'A': 0.1, 'C': 0.1, 'G': 0.1, 'T': 0.1}
>>> normalized_pro = normalize_probability(probabilities)
>>> normalized_pro
    {'A': 0.25, 'C': 0.25, 'G': 0.25, 'T': 0.25}