### Change Precision of complex_roots()

I am trying to find the complex roots of the polynomial

poly = x^7 - 6*x^6 + 15*x^5 - 20*x^4 + 15*x^3 - 6*x^2 + x

But when I do poly.complex_roots(), the system gives:

```
PariError: overflow in expo()
```

Apparently there are options for how much precision you want when computing roots -- one option is to use Pari, which is the high-precision option, and the other NumPy, which is the low-precision option. The default is set to use Pari, which apparently overloads when I try to compute the roots of this polynomial (and many others as well, this polynomial is just one example).

How do I change the complex_roots() function to get lower-precision roots?