# initializing the first layer, a list of dictionaries.
    experiments = []
    for assignment in assignments:
        match_sums = {}
        experiments.append(match_sums)


for i in xrange(len(classes)):
        for experiment in xrange(len(experiments)):
            # experiments[experiment][classes[i]] should hold a dictionary,
            # where the keys are the things that were matched against classes[i], 
            # and the value is the number of times this occurred.
            experiments[experiment][classes[i]] = collections.defaultdict(dict)

            # matches[experiment][i] is an integer for what the i'th match was in an experiment.
            # classes[j] for some integer j is the string name of the i'th match. could be "dog" or "cat".
            experiments[experiment][classes[i]][classes[matches[experiment][i]]] += 1
            total_class_sums[classes[i]] = total_class_sums.get(classes[i], 0) + 1

    print experiments[0]["cat"]["cat"]
    exit()
	
experiments[experiment][classes[i]][classes[matches[experiment][i]]] += 1
	
experiments = Counter()
...
experiments[experiment, classes[i], classes[matches[experiment][i]]] += 1
	
for className, classIdx in enumerate(classes):
    experiment = collections.defaultdict(list)
    experiments[className] = experiment
    for assignment,assignmentIdx in enumerate(assignments):
        counterpart = classes[matches[assignmentIdx][classIdx]]
        experiment[counterpart].append((assignment,assignmentIdx))

print(len(experiments["cat"]["cat"]), len(experiments["cat"]))