I am implementing the general `N-Grams` using `SymPy`
the equation is:
p(w1, w2, .... wn) = ∏ p(wi | wi-k, .... wi-1)
the input words is tuple tuple([w1, w2, w3, ... wn])
I tried to use `sympy.concrete.product.Product` with custom function that
calculates the probability as first argument
```
class Estimator(Function):
@classmethod
def eval(cls, token, history):
return "whatever"
class _Segment(Function):
@classmethod
def eval(cls, statement, i, k):
return (statement[i], statement[i - k:i - 1])
Product(Estimator(_Segment(statement, i, self._k)), (i, 1, len(statement)))
```
and I am getting error `indices must be integers, not Symbol`
k=1m
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