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⚡️ Speed up function string_to_uniform_number by 43% #43

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⚡️ Speed up function string_to_uniform_number by 43% #43

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13 changes: 7 additions & 6 deletions pr_agent/algo/utils.py
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Original file line number Diff line number Diff line change
Expand Up @@ -30,6 +30,8 @@
from pr_agent.config_loader import get_settings, global_settings
from pr_agent.log import get_logger

_MAX_HASH_INT_INV = 1.0 / ((1 << 256) - 1)


def get_model(model_type: str = "model_weak") -> str:
if model_type == "model_weak" and get_settings().get("config.model_weak"):
Expand Down Expand Up @@ -1308,12 +1310,11 @@ def string_to_uniform_number(s: str) -> float:
The uniform distribution is achieved by the nature of the SHA-256 hash function, which produces a uniformly distributed hash value over its output space.
"""
# Generate a hash of the string
hash_object = hashlib.sha256(s.encode())
# Convert the hash to an integer
hash_int = int(hash_object.hexdigest(), 16)
# Normalize the integer to the range [0, 1]
max_hash_int = 2 ** 256 - 1
uniform_number = float(hash_int) / max_hash_int
hash_bytes = hashlib.sha256(s.encode()).digest()
# Convert the hash to an integer directly from bytes
hash_int = int.from_bytes(hash_bytes, 'big')
# Normalize the integer to the range [0, 1] using precomputed inverse
uniform_number = hash_int * _MAX_HASH_INT_INV
return uniform_number


Expand Down