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Optimized wait generators. #204

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Optimized wait generators. #204

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37 changes: 18 additions & 19 deletions backoff/_wait_gen.py
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Original file line number Diff line number Diff line change
Expand Up @@ -22,20 +22,19 @@ def expo(
"""
# Advance past initial .send() call
yield # type: ignore[misc]
n = 0

a = factor
while max_value is None or a < max_value:
yield a
a *= base
while True:
a = factor * base ** n
if max_value is None or a < max_value:
yield a
n += 1
else:
yield max_value
yield max_value


def decay(
initial_value: float = 1,
decay_factor: float = 1,
min_value: Optional[float] = None
min_value: float = 0
) -> Generator[float, Any, None]:

"""Generator for exponential decay[1]:
Expand All @@ -51,14 +50,15 @@ def decay(
"""
# Advance past initial .send() call
yield # type: ignore[misc]

t = 0
while True:
a = initial_value
while a > min_value:
yield a
t += 1
a = initial_value * math.e ** (-t * decay_factor)
if min_value is None or a > min_value:
yield a
t += 1
else:
yield min_value
while True:
yield min_value
Comment on lines 54 to +61
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@yxtay yxtay Dec 22, 2023 •
edited
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Following what's done in expo to remove use of **.

Suggested change
t = 0
while True:
a = initial_value
while a > min_value:
yield a
t += 1
a = initial_value * math.e ** (-t * decay_factor)
if min_value is None or a > min_value:
yield a
t += 1
else:
yield min_value
while True:
yield min_value
a = initial_value
while a > min_value:
yield a
a /= math.exp(decay_factor)
while True:
yield min_value

Alternatively for line 57.

        a *= math.exp(-decay_factor)



def fibo(max_value: Optional[int] = None) -> Generator[int, None, None]:
Expand All @@ -74,12 +74,11 @@ def fibo(max_value: Optional[int] = None) -> Generator[int, None, None]:

a = 1
b = 1
while max_value is None or a < max_value:
yield a
a, b = b, a + b
while True:
if max_value is None or a < max_value:
yield a
a, b = b, a + b
else:
yield max_value
yield max_value


def constant(
Expand Down