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# neuron.py

# From Classic Computer Science Problems in Python Chapter 7

# Copyright 2018 David Kopec

#

# Licensed under the Apache License, Version 2.0 (the "License");

# you may not use this file except in compliance with the License.

# You may obtain a copy of the License at

#

# http://www.apache.org/licenses/LICENSE-2.0

#

# Unless required by applicable law or agreed to in writing, software

# distributed under the License is distributed on an "AS IS" BASIS,

# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.

# See the License for the specific language governing permissions and

# limitations under the License.

from typing import List, Callable

from util import dot_product

class Neuron:

def __init__(self, weights: List[float], learning_rate: float, activation_function: Callable[[float], float], derivative_activation_function: Callable[[float], float]) -> None:

self.weights: List[float] = weights

self.activation_function: Callable[[float], float] = activation_function

self.derivative_activation_function: Callable[[float], float] = derivative_activation_function

self.learning_rate: float = learning_rate

self.output_cache: float = 0.0

self.delta: float = 0.0

def output(self, inputs: List[float]) -> float:

self.output_cache = dot_product(inputs, self.weights)

return self.activation_function(self.output_cache)