53 lines
1.8 KiB
Python
53 lines
1.8 KiB
Python
import jax.numpy as jnp
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import jax.random
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from utils import mutate_float
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from . import BaseConnGene
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class DefaultConnGene(BaseConnGene):
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"Default connection gene, with the same behavior as in NEAT-python."
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custom_attrs = ['weight']
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def __init__(
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self,
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weight_init_mean: float = 0.0,
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weight_init_std: float = 1.0,
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weight_mutate_power: float = 0.5,
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weight_mutate_rate: float = 0.8,
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weight_replace_rate: float = 0.1,
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):
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super().__init__()
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self.weight_init_mean = weight_init_mean
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self.weight_init_std = weight_init_std
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self.weight_mutate_power = weight_mutate_power
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self.weight_mutate_rate = weight_mutate_rate
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self.weight_replace_rate = weight_replace_rate
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def new_attrs(self, state):
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return state, jnp.array([self.weight_init_mean])
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def mutate(self, state, conn):
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randkey_, randkey = jax.random.split(state.randkey, 2)
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input_index = conn[0]
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output_index = conn[1]
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enabled = conn[2]
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weight = mutate_float(randkey_,
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conn[3],
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self.weight_init_mean,
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self.weight_init_std,
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self.weight_mutate_power,
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self.weight_mutate_rate,
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self.weight_replace_rate
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)
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return state.update(randkey=randkey), jnp.array([input_index, output_index, enabled, weight])
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def distance(self, state, attrs1, attrs2):
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return state, (attrs1[2] != attrs2[2]) + jnp.abs(attrs1[3] - attrs2[3]) # enable + weight
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def forward(self, state, attrs, inputs):
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weight = attrs[0]
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return state, inputs * weight
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