covariance questions

• Matrix solution with Numpy: no solution?
• How to flatten a list with various data types (int, tuple)
• MultinomialNB error: "Unknown Label Type"
• CountVectorizer: "I" not showing up in vectorized text
• Best way to format large JSON file? (~30 mb)
• Python: Collections.Counter vs defaultdict(int)
• What does numpy.random.seed(0) do?

covariance answers