ImportError: cannot import name 'float_factorial'

Question

I'm trying to install and import talos ( https://github.com/autonomio/talos ) to my jupyter notebook. I used "pip install talos" on anaconda3 to install it. Everything went fine, but now when I try to import talos I get the following error:

import talos
ImportError: cannot import name 'float_factorial' from 'scipy._lib._util'(C:\Users\myname\Anaconda3\lib\site-packages\scipy\_lib\_util.py) 

The strange thing is that when I visit this specific folder, there is a float_factorial function so its unclear to me why this is not working. What could be causing this problem and how should I solve it?

Thanks in advance!

PS I'm using anaconda3, scipy 1.6.1 and talos 1.0.

Answer 1

I found a solution which works for me. Go to C:\Users\myname\Anaconda3\lib\site-packages\scipy_lib_util.py and edit the float_factorial function. Just rewrite it from this:

def float_factorial(n: int) -> float:
    """Compute the factorial and return as a float

    Returns infinity when result is too large for a double
    """
    return float(math.factorial(n)) if n < 171 else np.inf

To more simple where I removed the function annotation:

def float_factorial(num):
    """Compute the factorial and return as a float

    Returns infinity when result is too large for a double
    """
    val = float(math.factorial(num)) if num < 171 else np.inf
    return val

I suppose it is something with Python versions and changes in 3.8