{"metadata":{"kernelspec":{"language":"python","display_name":"Python 3","name":"python3"},"language_info":{"name":"python","version":"3.10.13","mimetype":"text/x-python","codemirror_mode":{"name":"ipython","version":3},"pygments_lexer":"ipython3","nbconvert_exporter":"python","file_extension":".py"},"kaggle":{"accelerator":"none","dataSources":[{"sourceId":3004,"databundleVersionId":861823,"sourceType":"competition"}],"dockerImageVersionId":30732,"isInternetEnabled":false,"language":"python","sourceType":"notebook","isGpuEnabled":false}},"nbformat_minor":4,"nbformat":4,"cells":[{"cell_type":"code","source":"import numpy as np\nimport pandas as pd\nfrom matplotlib import pyplot as plt\n\ndata = pd.read_csv('/kaggle/input/digit-recognizer/train.csv')","metadata":{"execution":{"iopub.status.busy":"2024-06-15T10:42:07.318287Z","iopub.execute_input":"2024-06-15T10:42:07.318634Z","iopub.status.idle":"2024-06-15T10:42:10.176946Z","shell.execute_reply.started":"2024-06-15T10:42:07.318599Z","shell.execute_reply":"2024-06-15T10:42:10.175938Z"},"trusted":true},"execution_count":null,"outputs":[]},{"cell_type":"code","source":"data.head()","metadata":{"execution":{"iopub.status.busy":"2024-06-15T10:42:10.179049Z","iopub.execute_input":"2024-06-15T10:42:10.179362Z","iopub.status.idle":"2024-06-15T10:42:10.198516Z","shell.execute_reply.started":"2024-06-15T10:42:10.179335Z","shell.execute_reply":"2024-06-15T10:42:10.197382Z"},"trusted":true},"execution_count":null,"outputs":[]},{"cell_type":"code","source":"data = np.array(data)\nm, n = data.shape\nnp.random.shuffle(data)\n\ndata_dev = data[0:1000].T\nY_dev = data_dev[0]\nX_dev = data_dev[1:n]\nX_dev = X_dev / 255.\n\ndata_train = data[1000:m].T\nY_train = data_train[0]\nX_train = data_train[1:n]\nX_train = X_train / 255.\n_,m_train = X_train.shape\n","metadata":{"execution":{"iopub.status.busy":"2024-06-15T10:42:10.199925Z","iopub.execute_input":"2024-06-15T10:42:10.200247Z","iopub.status.idle":"2024-06-15T10:42:11.008616Z","shell.execute_reply.started":"2024-06-15T10:42:10.200219Z","shell.execute_reply":"2024-06-15T10:42:11.007764Z"},"trusted":true},"execution_count":null,"outputs":[]},{"cell_type":"code","source":"X_train","metadata":{"execution":{"iopub.status.busy":"2024-06-15T10:42:11.009758Z","iopub.execute_input":"2024-06-15T10:42:11.010091Z","iopub.status.idle":"2024-06-15T10:42:11.018224Z","shell.execute_reply.started":"2024-06-15T10:42:11.010050Z","shell.execute_reply":"2024-06-15T10:42:11.016943Z"},"trusted":true},"execution_count":null,"outputs":[]},{"cell_type":"code","source":"Y_train","metadata":{"execution":{"iopub.status.busy":"2024-06-15T10:42:11.021251Z","iopub.execute_input":"2024-06-15T10:42:11.021780Z","iopub.status.idle":"2024-06-15T10:42:11.030343Z","shell.execute_reply.started":"2024-06-15T10:42:11.021741Z","shell.execute_reply":"2024-06-15T10:42:11.029374Z"},"trusted":true},"execution_count":null,"outputs":[]},{"cell_type":"code","source":"#mine\ndef init_params():\n    W1 = np.random.rand(10, 784) - 0.5\n    b1 = np.random.rand(10, 1) - 0.5\n    W2 = np.random.rand(10, 10) - 0.5\n    b2 = np.random.rand(10, 1) - 0.5\n    return W1, b1, W2, b2\n\ndef ReLU(Z):\n    return np.maximum(Z, 0)\n\ndef softmax(Z):\n    A = np.exp(Z) / sum(np.exp(Z))\n    return A\n\ndef forward_prop(W1, b1, W2, b2, X):\n    Z1 = W1.dot(X) + b1\n    A1 = ReLU(Z1)\n    Z2 = W2.dot(A1) + b2\n    A2 = softmax(Z2)\n    return Z1, A1, Z2, A2\n\ndef ReLU_deriv(Z):\n    return Z > 0\n\ndef one_hot(Y):\n    one_hot_Y = np.zeros((Y.size, Y.max() + 1))\n    one_hot_Y[np.arange(Y.size), Y] = 1\n    one_hot_Y = one_hot_Y.T\n    return one_hot_Y\n\ndef backward_prop(Z1, A1, Z2, A2, W1, W2, X, Y):\n    one_hot_Y = one_hot(Y)\n    dZ2 = A2 - one_hot_Y\n    dW2 = 1 / m * dZ2.dot(A1.T)\n    db2 = 1 / m * np.sum(dZ2)\n    dZ1 = W2.T.dot(dZ2) * ReLU_deriv(Z1)\n    dW1 = 1 / m * dZ1.dot(X.T)\n    db1 = 1 / m * np.sum(dZ1)\n    return dW1, db1, dW2, db2\n\ndef update_params(W1, b1, W2, b2, dW1, db1, dW2, db2, alpha):\n    W1 = W1 - alpha * dW1\n    b1 = b1 - alpha * db1\n    W2 = W2 - alpha * dW2\n    b2 = b2 - alpha * db2\n    return W1, b1, W2, b2\n\ndef get_predictions(A2):\n    return np.argmax(A2, 0)\n\ndef get_accuracy(predictions, Y):\n    print(predictions, Y)\n    return np.sum(predictions == Y) / Y.size\n\ndef gradient_descent(X, Y, alpha, iterations):\n    W1, b1, W2, b2 = init_params()\n    for i in range(iterations):\n        Z1, A1, Z2, A2 = forward_prop(W1, b1, W2, b2, X)\n        dW1, db1, dW2, db2 = backward_prop(Z1, A1, Z2, A2, W1, W2, X, Y)\n        W1, b1, W2, b2 = update_params(W1, b1, W2, b2, dW1, db1, dW2, db2, alpha)\n        if i % 10 == 0:\n            print(\"Iteration: \", i)\n            predictions = get_predictions(A2)\n            print(\"Accuracy: \", get_accuracy(predictions, Y))\n    return W1, b1, W2, b2","metadata":{"execution":{"iopub.status.busy":"2024-06-15T10:42:11.031558Z","iopub.execute_input":"2024-06-15T10:42:11.031913Z","iopub.status.idle":"2024-06-15T10:42:11.051668Z","shell.execute_reply.started":"2024-06-15T10:42:11.031859Z","shell.execute_reply":"2024-06-15T10:42:11.050529Z"},"trusted":true},"execution_count":null,"outputs":[]},{"cell_type":"code","source":"W1, b1, W2, b2 = gradient_descent(X_train, Y_train, iterations=500, alpha=0.10)","metadata":{"execution":{"iopub.status.busy":"2024-06-15T10:42:11.053163Z","iopub.execute_input":"2024-06-15T10:42:11.054203Z","iopub.status.idle":"2024-06-15T10:43:10.938942Z","shell.execute_reply.started":"2024-06-15T10:42:11.054170Z","shell.execute_reply":"2024-06-15T10:43:10.937460Z"},"trusted":true},"execution_count":null,"outputs":[]},{"cell_type":"code","source":"def make_predictions(X, W1, b1, W2, b2):\n    _, _, _, A2 = forward_prop(W1, b1, W2, b2, X)\n    predictions = get_predictions(A2)\n    return predictions\n\ndef test_prediction(index, W1, b1, W2, b2):\n    current_image = X_train[:, index, None]\n    prediction = make_predictions(X_train[:, index, None], W1, b1, W2, b2)\n    label = Y_train[index]\n    print(\"Prediction: \", prediction)\n    print(\"Label: \", label)\n    \n    current_image = current_image.reshape((28, 28)) * 255\n    plt.gray()\n    plt.imshow(current_image, interpolation='nearest')\n    plt.show()","metadata":{"execution":{"iopub.status.busy":"2024-06-15T10:57:57.567929Z","iopub.execute_input":"2024-06-15T10:57:57.568650Z","iopub.status.idle":"2024-06-15T10:57:57.576136Z","shell.execute_reply.started":"2024-06-15T10:57:57.568617Z","shell.execute_reply":"2024-06-15T10:57:57.575084Z"},"trusted":true},"execution_count":null,"outputs":[]},{"cell_type":"code","source":"test_prediction(0, W1, b1, W2, b2)\ntest_prediction(1, W1, b1, W2, b2)\ntest_prediction(2, W1, b1, W2, b2)\ntest_prediction(3, W1, b1, W2, b2)","metadata":{"execution":{"iopub.status.busy":"2024-06-15T10:58:18.433365Z","iopub.execute_input":"2024-06-15T10:58:18.434016Z","iopub.status.idle":"2024-06-15T10:58:19.313753Z","shell.execute_reply.started":"2024-06-15T10:58:18.433984Z","shell.execute_reply":"2024-06-15T10:58:19.312819Z"},"trusted":true},"execution_count":null,"outputs":[]}]}