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"""
Various function that can be usefull
"""
import numpy as np
from scipy.spatial.distance import cdist
def unif(n):
""" return a uniform histogram (simplex) """
return np.ones((n,))/n
def dist(x1,x2=None,metric='sqeuclidean'):
"""Compute distance between samples in x1 and x2"""
if x2 is None:
return cdist(x1,x1,metric=metric)
else:
return cdist(x1,x2,metric=metric)
def dist0(n,method='linear'):
"""Compute stardard cos matrices for OT problems"""
res=0
if method=='linear':
x=np.arange(n,dtype=np.float64).reshape((n,1))
res=dist(x,x)
return res
def dots(*args):
""" Stupid but nice dots function for multiple matrix multiply """
return reduce(np.dot,args)
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