commit 4b12aa44f2c532041ee6a37a4289156bc432e71d
Author: Nicola Zangrandi <wasp@wasp.dev>
Date:   Thu Feb 8 09:55:43 2024 +0100

    Split from monorepo

diff --git a/.gitattributes b/.gitattributes
new file mode 100644
index 0000000..dfe0770
--- /dev/null
+++ b/.gitattributes
@@ -0,0 +1,2 @@
+# Auto detect text files and perform LF normalization
+* text=auto
diff --git a/.gitignore b/.gitignore
new file mode 100644
index 0000000..a8cd494
--- /dev/null
+++ b/.gitignore
@@ -0,0 +1,104 @@
+# Byte-compiled / optimized / DLL files
+__pycache__/
+*.py[cod]
+*$py.class
+
+# C extensions
+*.so
+
+# Distribution / packaging
+.Python
+build/
+develop-eggs/
+dist/
+downloads/
+eggs/
+.eggs/
+lib/
+lib64/
+parts/
+sdist/
+var/
+wheels/
+*.egg-info/
+.installed.cfg
+*.egg
+
+# PyInstaller
+#  Usually these files are written by a python script from a template
+#  before PyInstaller builds the exe, so as to inject date/other infos into it.
+*.manifest
+*.spec
+
+# Installer logs
+pip-log.txt
+pip-delete-this-directory.txt
+
+# Unit test / coverage reports
+htmlcov/
+.tox/
+.coverage
+.coverage.*
+.cache
+nosetests.xml
+coverage.xml
+*.cover
+.hypothesis/
+
+# Translations
+*.mo
+*.pot
+
+# Django stuff:
+*.log
+local_settings.py
+
+# Flask stuff:
+instance/
+.webassets-cache
+
+# Scrapy stuff:
+.scrapy
+
+# Sphinx documentation
+docs/_build/
+
+# PyBuilder
+target/
+
+# Jupyter Notebook
+.ipynb_checkpoints
+
+# pyenv
+.python-version
+
+# celery beat schedule file
+celerybeat-schedule
+
+# SageMath parsed files
+*.sage.py
+
+# Environments
+.env
+.venv
+env/
+venv/
+ENV/
+
+# Spyder project settings
+.spyderproject
+.spyproject
+
+# Rope project settings
+.ropeproject
+
+# mkdocs documentation
+/site
+
+# mypy
+.mypy_cache/
+.idea/inspectionProfiles/Project_Default.xml
+.idea/misc.xml
+.idea/modules.xml
+.idea/workspace.xml
+.idea/NeuralNetwork.iml
diff --git a/Matrix.py b/Matrix.py
new file mode 100644
index 0000000..eaacf66
--- /dev/null
+++ b/Matrix.py
@@ -0,0 +1,84 @@
+import random
+
+
+class Matrix:
+    def __init__(self, rows, cols):
+        self.rows = rows
+        self.cols = cols
+        self.data = []
+        
+        for i in range(0, rows):
+            self.data.append([0 for _ in range(0, cols)])
+
+    @staticmethod
+    def from_list(lst):
+        m = Matrix(len(lst), 1)
+        m.map(lambda x, i, j: lst[i])
+        return m
+
+    @staticmethod
+    def product(a, b):
+        """Matrix product"""
+        if a.cols != b.rows:
+            return None
+
+        result = Matrix(a.rows, b.cols)
+        result.map(lambda x, i, j: sum([a.data[i][k] * b.data[k][j] for k in range(0, a.cols)]))
+
+        return result
+
+    @staticmethod
+    def transpose(m):
+        """Transpose a matrix"""
+        result = Matrix(m.cols, m.rows)
+        result.map(lambda x, i, j: m.data[j][i])
+        return result
+
+    @staticmethod
+    def subtract(a, b):
+        result = Matrix(a.rows, a.cols)
+        result.map(lambda x, i, j: a.data[i][j] - b.data[i][j])
+        return result
+
+    @staticmethod
+    def clone(m):
+        result = Matrix(m.rows, m.cols)
+        result.map(lambda x, i, j: m.data[i][j])
+        return result
+
+    def map(self, fun):
+        """Execute a function on every element of the list, use the return value as the new value of the element"""
+        for i in range(0, self.rows):
+            for j in range(0, self.cols):
+                self.data[i][j] = fun(self.data[i][j], i, j)
+
+    def randomize(self):
+        """Fill the matrix with random integers"""
+        self.map(lambda x, i, j: random.randint(-1, 1))
+
+    def multiply(self, n):
+        """Hadamard or scalar product"""
+        if type(n) is Matrix:
+            self.map(lambda x, i, j: x * n.data[i][j])
+        else:
+            self.map(lambda x, i, j: x * n)
+
+    def add(self, n):
+        """Entrywise or scalar addition"""
+        if type(n) is Matrix:
+            self.map(lambda x, i, j: x + n.data[i][j])
+        else:
+            self.map(lambda x, i, j: x + n)
+
+    def print(self):
+        """Pretty print the matrix"""
+        for row in self.data:
+            for elem in row:
+                print(elem, end='\t')
+            print()
+
+    def to_list(self):
+        """Returns the internal matrix as a list"""
+        lst = []
+        self.map(lambda x, i, j: lst.append(x))
+        return lst
diff --git a/NeuralNetwork.py b/NeuralNetwork.py
new file mode 100644
index 0000000..0a534b0
--- /dev/null
+++ b/NeuralNetwork.py
@@ -0,0 +1,83 @@
+import math
+from Matrix import Matrix
+
+
+def sigmoid(x):
+    """The Sigmoid function"""
+    return 1 / (1 + math.exp(-x))
+
+
+def dsigmoid(x):
+    """The derivative of the Sigmoid function"""
+    return sigmoid(x) * (1 - sigmoid(x))
+
+
+class NeuralNetwork:
+    def __init__(self, num_i, num_h, num_o):
+        self.learning_rate = 0.1
+        self.input_nodes = num_i
+        self.hidden_nodes = num_h
+        self.output_nodes = num_o
+
+        self.weights_ih = Matrix(self.hidden_nodes, self.input_nodes)
+        self.weights_ho = Matrix(self.output_nodes, self.hidden_nodes)
+        self.bias_h = Matrix(self.hidden_nodes, 1)
+        self.bias_o = Matrix(self.output_nodes, 1)
+
+        self.weights_ih.randomize()
+        self.weights_ho.randomize()
+        self.bias_h.randomize()
+        self.bias_o.randomize()
+
+    def feedforward(self, input_list):
+        """Feedforward algorithm, basically the hidden layer"""
+        inputs = Matrix.from_list(input_list)
+        hidden = Matrix.product(self.weights_ih, inputs)
+        hidden.add(self.bias_h)
+        hidden.map(lambda x, i, j: sigmoid(x))
+
+        output = Matrix.product(self.weights_ho, hidden)
+        output.add(self.bias_o)
+        output.map(lambda x, i, j: sigmoid(x))
+
+        return output.to_list()
+
+    def train(self, input_list, answer):
+        """Train the NN on a known input/answer combination"""
+        inputs = Matrix.from_list(input_list)
+        hidden = Matrix.product(self.weights_ih, inputs)
+        hidden.add(self.bias_h)
+        hidden.map(lambda x, i, j: sigmoid(x))
+
+        outputs = Matrix.product(self.weights_ho, hidden)
+        outputs.add(self.bias_o)
+        outputs.map(lambda x, i, j: sigmoid(x))
+
+        targets = Matrix.from_list(answer)
+
+        output_errors = Matrix.subtract(targets, outputs)
+
+        gradients = Matrix.clone(outputs)
+        gradients.map(lambda x, i, j: x * (1 - x))
+        gradients.multiply(output_errors)
+        gradients.multiply(self.learning_rate)
+
+        hidden_t = Matrix.transpose(hidden)
+        weight_ho_deltas = Matrix.product(gradients, hidden_t)
+
+        self.weights_ho.add(weight_ho_deltas)
+        self.bias_o.add(gradients)
+
+        who_t = Matrix.transpose(self.weights_ho)
+        hidden_errors = Matrix.product(who_t, output_errors)
+
+        hidden_gradient = Matrix.clone(hidden)
+        hidden_gradient.map(lambda x, i, j: x * (1 - x))
+        hidden_gradient.multiply(hidden_errors)
+        hidden_gradient.multiply(self.learning_rate)
+
+        inputs_t = Matrix.transpose(inputs)
+        weight_ih_deltas = Matrix.product(hidden_gradient, inputs_t)
+
+        self.weights_ih.add(weight_ih_deltas)
+        self.bias_h.add(hidden_gradient)
diff --git a/Perceptron.py b/Perceptron.py
new file mode 100644
index 0000000..96100ca
--- /dev/null
+++ b/Perceptron.py
@@ -0,0 +1,32 @@
+import random
+
+class Perceptron:
+    def __init__(self, n):
+        self.weights = [random.randint(-1, 1) for _ in range(0, n)]
+        self.lr = 0.1
+
+    @staticmethod
+    def sign(output):
+        if output >= 0:
+            return 1
+        else:
+            return -1
+
+    def guess(self, inputs):
+        s = 0
+        for i, inp in enumerate(inputs):
+            s += inp * self.weights[i]
+
+        return Perceptron.sign(s)
+    
+    def guessY(self, x):
+        w0 = self.weights[0]
+        w1 = self.weights[1]
+        w2 = self.weights[2]
+        
+        return -(w2 / w1) - (w0 / w1) * x
+
+    def train(self, inputs, target):
+        error = target - self.guess(inputs)
+        for i, w in enumerate(self.weights):
+            self.weights[i] += error * inputs[i] * self.lr