K nearest neighbors

models/knn.py

@@ -0,0 +1,33 @@
+from sklearn.neighbors import KNeighborsClassifier, KNeighborsRegressor
+from sklearn.metrics import accuracy_score, mean_squared_error
+
+class KNNClassifier:
+    def __init__(self, n_neighbors=3):
+        self.n_neighbors = n_neighbors
+        self.model = KNeighborsClassifier(n_neighbors=self.n_neighbors)
+
+    def train(self, X, y):
+        self.model.fit(X, y)
+
+    def predict(self, X):
+        return self.model.predict(X)
+
+    def evaluate(self, X, y):
+        y_pred = self.predict(X)
+        return accuracy_score(y, y_pred)
+
+
+class KNNRegressor:
+    def __init__(self, n_neighbors=3):
+        self.n_neighbors = n_neighbors
+        self.model = KNeighborsRegressor(n_neighbors=self.n_neighbors)
+
+    def train(self, X, y):
+        self.model.fit(X, y)
+
+    def predict(self, X):
+        return self.model.predict(X)
+
+    def evaluate(self, X, y):
+        y_pred = self.predict(X)
+        return mean_squared_error(y, y_pred, squared=False)  # RMSE

models/svm.py

@@ -0,0 +1,5 @@
+from utils.plot_helpers import plot_confusion_matrix
+import streamlit as st
+
+fig = plot_confusion_matrix(y_true, y_pred, labels=["Class 0", "Class 1"], cmap="Purples")
+st.pyplot(fig)

pages/KNN.py

@@ -0,0 +1,66 @@
+import streamlit as st
+import numpy as np
+import matplotlib.pyplot as plt
+from sklearn import datasets
+from models.knn import KNNClassifier, KNNRegressor
+from utils.plot_helpers import plot_confusion_matrix
+
+st.title("🧩 K-Nearest Neighbors (KNN) Simulator")
+
+mode = st.radio("Choose Mode", ["Classification", "Regression"])
+
+if mode == "Classification":
+    st.subheader("KNN Classifier Visualization")
+
+    # Load dataset
+    X, y = datasets.make_classification(
+        n_samples=150, n_features=2, n_informative=2, n_redundant=0,
+        n_clusters_per_class=1, random_state=42
+    )
+
+    k = st.slider("Number of Neighbors (k)", 1, 15, 3)
+    model = KNNClassifier(n_neighbors=k)
+    model.train(X, y)
+    y_pred = model.predict(X)
+
+    # Decision boundary
+    x_min, x_max = X[:, 0].min() - 1, X[:, 0].max() + 1
+    y_min, y_max = X[:, 1].min() - 1, X[:, 1].max() + 1
+    xx, yy = np.meshgrid(np.linspace(x_min, x_max, 300),
+                         np.linspace(y_min, y_max, 300))
+    Z = model.predict(np.c_[xx.ravel(), yy.ravel()])
+    Z = Z.reshape(xx.shape)
+
+    plt.figure(figsize=(8, 6))
+    plt.contourf(xx, yy, Z, cmap="coolwarm", alpha=0.5)
+    plt.scatter(X[:, 0], X[:, 1], c=y, cmap="coolwarm", edgecolors="k")
+    plt.title(f"KNN Classifier (k={k})")
+    st.pyplot(plt)
+
+    st.write(f"**Accuracy:** {model.evaluate(X, y):.2f}")
+
+    # Confusion matrix
+    fig = plot_confusion_matrix(y, y_pred, labels=["Class 0", "Class 1"], cmap="Purples")
+    st.pyplot(fig)
+
+else:
+    st.subheader("KNN Regressor Visualization")
+
+    # Generate regression dataset
+    X = np.linspace(0, 10, 100).reshape(-1, 1)
+    y = np.sin(X).ravel() + np.random.randn(100) * 0.1
+
+    k = st.slider("Number of Neighbors (k)", 1, 15, 3)
+    model = KNNRegressor(n_neighbors=k)
+    model.train(X, y)
+    y_pred = model.predict(X)
+
+    # Plot regression
+    plt.figure(figsize=(8, 6))
+    plt.scatter(X, y, color="blue", label="Data")
+    plt.plot(X, y_pred, color="red", label=f"KNN Prediction (k={k})")
+    plt.title("KNN Regression")
+    plt.legend()
+    st.pyplot(plt)
+
+    st.write(f"**RMSE:** {model.evaluate(X, y):.3f}")

pages/LogisticRegression.py

@@ -0,0 +1,6 @@
+from utils.plot_helpers import plot_roc_curve
+import streamlit as st
+
+# Example
+fig = plot_roc_curve(y_true, y_pred_proba)
+st.pyplot(fig)

pages/svm.py

@@ -0,0 +1,62 @@
+import streamlit as st
+import numpy as np
+import matplotlib.pyplot as plt
+from sklearn import datasets
+from models.svm import SVMClassifier, SVMRegressor
+
+st.title("🔷 Support Vector Machine (SVM) Simulator")
+
+option = st.radio("Choose Mode", ["Classification", "Regression"])
+
+if option == "Classification":
+    st.subheader("SVM Classifier Visualization")
+
+    # Load toy dataset
+    X, y = datasets.make_blobs(n_samples=100, centers=2, random_state=6, cluster_std=1.2)
+
+    kernel = st.selectbox("Kernel", ["linear", "poly", "rbf", "sigmoid"])
+    C = st.slider("Regularization (C)", 0.01, 10.0, 1.0)
+
+    model = SVMClassifier(kernel=kernel, C=C)
+    model.train(X, y)
+
+    # Plot decision boundary
+    x_min, x_max = X[:, 0].min() - 1, X[:, 0].max() + 1
+    y_min, y_max = X[:, 1].min() - 1, X[:, 1].max() + 1
+    xx, yy = np.meshgrid(np.linspace(x_min, x_max, 300),
+                         np.linspace(y_min, y_max, 300))
+    Z = model.predict(np.c_[xx.ravel(), yy.ravel()])
+    Z = Z.reshape(xx.shape)
+
+    plt.figure(figsize=(8, 6))
+    plt.contourf(xx, yy, Z, cmap='coolwarm', alpha=0.6)
+    plt.scatter(X[:, 0], X[:, 1], c=y, cmap='coolwarm', edgecolors='k')
+    plt.scatter(model.get_support_vectors()[:, 0], model.get_support_vectors()[:, 1],
+                s=100, facecolors='none', edgecolors='yellow', label='Support Vectors')
+    plt.legend()
+    st.pyplot(plt)
+    st.write(f"**Accuracy:** {model.evaluate(X, y):.2f}")
+
+else:
+    st.subheader("SVM Regressor Visualization")
+
+    # Generate regression dataset
+    X = np.sort(5 * np.random.rand(100, 1), axis=0)
+    y = np.sin(X).ravel() + np.random.randn(100) * 0.1
+
+    kernel = st.selectbox("Kernel", ["linear", "poly", "rbf", "sigmoid"])
+    C = st.slider("Regularization (C)", 0.1, 10.0, 1.0)
+    epsilon = st.slider("Epsilon", 0.01, 1.0, 0.1)
+
+    model = SVMRegressor(kernel=kernel, C=C, epsilon=epsilon)
+    model.train(X, y)
+    y_pred = model.predict(X)
+
+    # Plot regression curve
+    plt.figure(figsize=(8, 6))
+    plt.scatter(X, y, color="blue", label="Data")
+    plt.plot(X, y_pred, color="red", label="SVM Prediction")
+    plt.title("SVM Regression")
+    plt.legend()
+    st.pyplot(plt)
+    st.write(f"**RMSE:** {model.evaluate(X, y):.3f}")

utils/plot_helpers.py

@@ -1,28 +1,41 @@
 import matplotlib.pyplot as plt
 import seaborn as sns
-from sklearn.metrics import confusion_matrix, roc_curve, auc
+from sklearn.metrics import confusion_matrix
 
-def plot_regression_line(X, y, model):
-    plt.figure()
-    plt.scatter(X, y, color="blue", label="Data")
-    y_pred = model.predict(X)
-    plt.plot(X, y_pred, color="red", label="Prediction")
-    plt.legend()
-    return plt
+def plot_confusion_matrix(y_true, y_pred, labels=None, annotate=True, cmap="Blues"):
+    """
+    Plots a customizable confusion matrix.
+
+    Parameters:
+        y_true (array-like): Ground truth labels.
+        y_pred (array-like): Predicted labels.
+        labels (list, optional): Class names to display on axes.
+        annotate (bool): Whether to show cell values.
+        cmap (str): Colormap for heatmap (e.g. 'Blues', 'Greens', 'Oranges').
+
+    Returns:
+        fig (matplotlib.figure.Figure): The confusion matrix figure.
+    """
 
-def plot_confusion_matrix(y_true, y_pred, labels):
     cm = confusion_matrix(y_true, y_pred)
-    plt.figure()
-    sns.heatmap(cm, annot=True, fmt="d", cmap="Blues", xticklabels=labels, yticklabels=labels)
-    plt.xlabel("Predicted")
-    plt.ylabel("Actual")
-    return plt
+    fig, ax = plt.subplots(figsize=(6, 5))
+    sns.set_style("whitegrid")
+
+    sns.heatmap(
+        cm,
+        annot=annotate,
+        fmt="d" if annotate else "",
+        cmap=cmap,
+        cbar=False,
+        xticklabels=labels if labels is not None else "auto",
+        yticklabels=labels if labels is not None else "auto",
+        linewidths=0.5,
+        ax=ax,
+    )
+
+    ax.set_xlabel("Predicted Labels", fontsize=11)
+    ax.set_ylabel("True Labels", fontsize=11)
+    ax.set_title("Confusion Matrix", fontsize=13, pad=12)
 
-def plot_roc_curve(y_true, y_scores):
-    fpr, tpr, _ = roc_curve(y_true, y_scores)
-    roc_auc = auc(fpr, tpr)
-    plt.figure()
-    plt.plot(fpr, tpr, label=f"AUC = {roc_auc:.2f}")
-    plt.plot([0, 1], [0, 1], linestyle="--")
-    plt.legend()
-    return plt
+    plt.tight_layout()
+    return fig