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devicehub-teal/ereuse_devicehub/resources/action/rate/rate.py

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import math
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from typing import Iterable
from ereuse_devicehub.resources.device.models import Device
class BaseRate:
"""Growing exponential from this value."""
CEXP = 0
"""Growing lineal starting on this value."""
CLIN = 242
"""Growing logarithmic starting on this value."""
CLOG = 0.5
"""Processor has 50% of weight over total score, used in harmonic mean."""
PROCESSOR_WEIGHT = 0.5
"""Storage has 20% of weight over total score, used in harmonic mean."""
DATA_STORAGE_WEIGHT = 0.2
"""Ram has 30% of weight over total score, used in harmonic mean."""
RAM_WEIGHT = 0.3
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def compute(self, device: Device):
raise NotImplementedError()
@staticmethod
def norm(x, x_min, x_max):
return (x - x_min) / (x_max - x_min)
@staticmethod
def rate_log(x):
return math.log10(2 * x) + 3.57 # todo magic number!
@staticmethod
def rate_lin(x):
return 7 * x + 0.06 # todo magic number!
@staticmethod
def rate_exp(x):
return math.exp(x) / (2 - math.exp(x))
@staticmethod
def harmonic_mean(weights: Iterable[float], rates: Iterable[float]):
return sum(weights) / sum(char / rate for char, rate in zip(weights, rates))
def harmonic_mean_rates(self, rate_processor, rate_storage, rate_ram):
"""Merging components using harmonic formula."""
total_weights = self.PROCESSOR_WEIGHT + self.DATA_STORAGE_WEIGHT + self.RAM_WEIGHT
total_rate = self.PROCESSOR_WEIGHT / rate_processor \
+ self.DATA_STORAGE_WEIGHT / rate_storage \
+ self.RAM_WEIGHT / rate_ram
return total_weights / total_rate