mirror of
https://github.com/3b1b/manim.git
synced 2025-04-13 09:47:07 +00:00
39 lines
1,019 B
Python
39 lines
1,019 B
Python
import numpy as np
|
|
import operator as op
|
|
import inspect
|
|
from functools import reduce
|
|
|
|
|
|
def sigmoid(x):
|
|
return 1.0 / (1 + np.exp(-x))
|
|
|
|
|
|
def choose(n, r):
|
|
if n < r:
|
|
return 0
|
|
if r == 0:
|
|
return 1
|
|
denom = reduce(op.mul, range(1, r + 1), 1)
|
|
numer = reduce(op.mul, range(n, n - r, -1), 1)
|
|
return numer // denom
|
|
|
|
|
|
def get_num_args(function):
|
|
return len(inspect.signature(function).parameters)
|
|
|
|
# Just to have a less heavyweight name for this extremely common operation
|
|
#
|
|
# We may wish to have more fine-grained control over division by zero behavior
|
|
# in the future (separate specifiable values for 0/0 and x/0 with x != 0),
|
|
# but for now, we just allow the option to handle indeterminate 0/0.
|
|
|
|
|
|
def fdiv(a, b, zero_over_zero_value=None):
|
|
if zero_over_zero_value is not None:
|
|
out = np.full_like(a, zero_over_zero_value)
|
|
where = np.logical_or(a != 0, b != 0)
|
|
else:
|
|
out = None
|
|
where = True
|
|
|
|
return np.true_divide(a, b, out=out, where=where)
|