Without seeing the full context (e.g the value of review that gets passed into constructor) is it possible your KaggleWord2VecUtility method is splitting on the @ symbol and/or the digit, such that a token is being passed as a float instead of a string/unicode object? The exception indicates that markup is an unexpected float when init is expecting a string or unicode object
def __init__(self, markup="", features=None, builder=None, parse_only=None, from_encoding=None, **kwargs):