MediumNLPnlp-332

Type Token Ratio

Problem

The type-token ratio is the number of distinct types divided by the total number of tokens, a basic lexical diversity measure.

Given the token list, return the ratio, or 0.0 for an empty list.

Hint

Types over tokens.

case 1

in: [["a","b","a"]]

expected: 0.6666666666666666

case 2

in: [["x","y","z"]]

expected: 1

case 3

in: [[]]

expected: 0

Starter codePython

def type_token_ratio(tokens):
    # Your code here
    pass

3 test cases · run your code against them in the editor