def group_concat(arg, sep=','):
    return _ops.GroupConcat(arg, sep).to_expr()
Takes a `Tf` model object and generates a `TfIdf` model.
dataset/ETHPy150Open cloudera/ibis/ibis/expr/api.py/group_concat--crossover with--dataset/ETHPy150Open inpho/vsm/vsm/model/tfidf.py/TfIdf.from_tf