from collections import Counter
from itertools import chain
d = {(0): [0.1, 0.2, 0.1], (1): [1.1, 1.2, 0.1], (2): [2.1, 2.2, 0.1]}
c = Counter(chain.from_iterable(list(d.values())))
print(c)
Python: use of Counter in a dictionary of lists