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Add FruitToEmoji tutorial
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‎FruitToEmoji/FruitToEmoji.ipynb‎

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{
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"nbformat": 4,
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"nbformat_minor": 0,
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"metadata": {
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"colab": {
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"name": "FruitToEmoji-GIT.ipynb",
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"provenance": [],
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"collapsed_sections": [],
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"toc_visible": true
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},
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"kernelspec": {
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"name": "python3",
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"display_name": "Python 3"
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}
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},
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"cells": [
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{
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"cell_type": "markdown",
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"metadata": {
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"id": "f92-4Hjy7kA8",
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"colab_type": "text"
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},
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"source": [
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"<a href=\"https://www.arduino.cc/\"><img src=\"https://raw.githubusercontent.com/sandeepmistry/aimldevfest-workshop-2019/master/images/Arduino_logo_R_highquality.png\" width=200/></a>\n",
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"# Tiny ML on Arduino\n",
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"## Classify objects by color tutorial\n",
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"\n",
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" \n",
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"https://github.com/arduino/ArduinoTensorFlowLiteTutorials/"
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]
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},
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{
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"cell_type": "markdown",
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"metadata": {
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"id": "uvDA8AK7QOq-",
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"colab_type": "text"
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},
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"source": [
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"## Setup Python Environment \n",
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"\n",
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"The next cell sets up the dependencies in required for the notebook, run it."
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]
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},
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{
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"cell_type": "code",
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"metadata": {
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"id": "Y2gs-PL4xDkZ",
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"colab_type": "code",
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"colab": {}
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},
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"source": [
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"# Setup environment\n",
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"!apt-get -qq install xxd\n",
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"!pip install pandas numpy matplotlib\n",
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"%tensorflow_version 2.x\n",
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"!pip install tensorflow"
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],
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"execution_count": 0,
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"outputs": []
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},
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{
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"cell_type": "markdown",
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"metadata": {
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"id": "9lwkeshJk7dg",
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"colab_type": "text"
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},
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"source": [
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"# Upload Data\n",
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"\n",
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"1. Open the panel on the left side of Colab by clicking on the __>__\n",
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"1. Select the Files tab\n",
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"1. Drag `csv` files from your computer to the tab to upload them into colab."
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]
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},
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{
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"cell_type": "markdown",
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"metadata": {
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"id": "kSxUeYPNQbOg",
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"colab_type": "text"
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},
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"source": [
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"# Train Neural Network\n",
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"\n",
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"\n",
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"\n"
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]
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},
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{
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"cell_type": "markdown",
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"metadata": {
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"id": "Gxk414PU3oy3",
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"colab_type": "text"
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},
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"source": [
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"## Parse and prepare the data\n",
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"\n",
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"The next cell parses the csv files and transforms them to a format that will be used to train the full connected neural network.\n",
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"\n"
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]
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},
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{
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"cell_type": "code",
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"metadata": {
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"id": "AGChd1FAk5_j",
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"colab_type": "code",
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"colab": {}
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},
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"source": [
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"import matplotlib.pyplot as plt\n",
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"import numpy as np\n",
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"import pandas as pd\n",
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"import tensorflow as tf\n",
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"import os\n",
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"import fileinput\n",
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"\n",
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"print(f\"TensorFlow version = {tf.__version__}\\n\")\n",
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"\n",
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"# Set a fixed random seed value, for reproducibility, this will allow us to get\n",
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"# the same random numbers each time the notebook is run\n",
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"SEED = 1337\n",
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"np.random.seed(SEED)\n",
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"tf.random.set_seed(SEED)\n",
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"\n",
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"CLASSES = [];\n",
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"\n",
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"for file in os.listdir(\"/content/\"):\n",
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" if file.endswith(\".csv\"):\n",
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" CLASSES.append(os.path.splitext(file)[0])\n",
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"\n",
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"CLASSES.sort()\n",
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"\n",
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"SAMPLES_WINDOW_LEN = 1\n",
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"NUM_CLASSES = len(CLASSES)\n",
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"\n",
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"# create a one-hot encoded matrix that is used in the output\n",
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"ONE_HOT_ENCODED_CLASSES = np.eye(NUM_CLASSES)\n",
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"\n",
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"inputs = []\n",
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"outputs = []\n",
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"\n",
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"# read each csv file and push an input and output\n",
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"for class_index in range(NUM_CLASSES):\n",
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" objectClass = CLASSES[class_index]\n",
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" df = pd.read_csv(\"/content/\" + objectClass + \".csv\")\n",
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" columns = list(df)\n",
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" # get rid of pesky empty value lines of csv which cause NaN inputs to TensorFlow\n",
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" df = df.dropna()\n",
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" df = df.reset_index(drop=True)\n",
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" \n",
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" # calculate the number of objectClass recordings in the file\n",
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" num_recordings = int(df.shape[0] / SAMPLES_WINDOW_LEN)\n",
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" print(f\"\\u001b[32;4m{objectClass}\\u001b[0m class will be output \\u001b[32m{class_index}\\u001b[0m of the classifier\")\n",
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" print(f\"{num_recordings} samples captured for training with inputs {list(df)} \\n\")\n",
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"\n",
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" # graphing\n",
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" plt.rcParams[\"figure.figsize\"] = (10,1)\n",
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" pixels = np.array([df['Red'],df['Green'],df['Blue']],float)\n",
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" pixels = np.transpose(pixels)\n",
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" for i in range(num_recordings):\n",
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" plt.axvline(x=i, linewidth=8, color=tuple(pixels[i]/np.max(pixels[i], axis=0)))\n",
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" plt.show()\n",
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" \n",
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" #tensors\n",
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" output = ONE_HOT_ENCODED_CLASSES[class_index]\n",
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" for i in range(num_recordings):\n",
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" tensor = []\n",
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" row = []\n",
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" for c in columns:\n",
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" row.append(df[c][i])\n",
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" tensor += row\n",
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" inputs.append(tensor)\n",
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" outputs.append(output)\n",
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"\n",
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"# convert the list to numpy array\n",
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"inputs = np.array(inputs)\n",
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"outputs = np.array(outputs)\n",
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"\n",
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"print(\"Data set parsing and preparation complete.\")\n",
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"\n",
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"# Randomize the order of the inputs, so they can be evenly distributed for training, testing, and validation\n",
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"# https://stackoverflow.com/a/37710486/2020087\n",
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"num_inputs = len(inputs)\n",
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"randomize = np.arange(num_inputs)\n",
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"np.random.shuffle(randomize)\n",
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"\n",
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"# Swap the consecutive indexes (0, 1, 2, etc) with the randomized indexes\n",
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"inputs = inputs[randomize]\n",
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"outputs = outputs[randomize]\n",
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"\n",
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"# Split the recordings (group of samples) into three sets: training, testing and validation\n",
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"TRAIN_SPLIT = int(0.6 * num_inputs)\n",
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"TEST_SPLIT = int(0.2 * num_inputs + TRAIN_SPLIT)\n",
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"\n",
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"inputs_train, inputs_test, inputs_validate = np.split(inputs, [TRAIN_SPLIT, TEST_SPLIT])\n",
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"outputs_train, outputs_test, outputs_validate = np.split(outputs, [TRAIN_SPLIT, TEST_SPLIT])\n",
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"\n",
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"print(\"Data set randomization and splitting complete.\")\n"
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],
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"execution_count": 0,
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"outputs": []
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},
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{
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"cell_type": "markdown",
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"metadata": {
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"colab_type": "text",
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"id": "v8qlSAX1b6Yv"
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},
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"source": [
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"## Build & Train the Model\n",
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"\n",
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"Build and train a [TensorFlow](https://www.tensorflow.org) model using the high-level [Keras](https://www.tensorflow.org/guide/keras) API."
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]
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},
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{
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"cell_type": "code",
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"metadata": {
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"id": "kGNFa-lX24Qo",
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"colab_type": "code",
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"colab": {}
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},
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"source": [
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"# build the model and train it\n",
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"model = tf.keras.Sequential()\n",
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"model.add(tf.keras.layers.Dense(8, activation='relu')) # relu is used for performance\n",
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"model.add(tf.keras.layers.Dense(5, activation='relu'))\n",
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"model.add(tf.keras.layers.Dense(NUM_CLASSES, activation='softmax')) # softmax is used, because we only expect one class to occur per input\n",
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"model.compile(optimizer='rmsprop', loss='mse', metrics=['mae'])\n",
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"history = model.fit(inputs_train, outputs_train, epochs=400, batch_size=4, validation_data=(inputs_validate, outputs_validate))\n",
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"\n"
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],
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"execution_count": 0,
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"outputs": []
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},
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{
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"cell_type": "markdown",
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"metadata": {
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"id": "guMjtfa42ahM",
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"colab_type": "text"
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},
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"source": [
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"### Run with Test Data\n",
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"Put our test data into the model and plot the predictions\n"
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]
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},
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{
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"cell_type": "code",
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"metadata": {
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"id": "V3Y0CCWJz2EK",
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"colab_type": "code",
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"colab": {}
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},
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"source": [
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"# use the model to predict the test inputs\n",
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"predictions = model.predict(inputs_test)\n",
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"\n",
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"# print the predictions and the expected ouputs\n",
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"print(\"predictions =\\n\", np.round(predictions, decimals=3))\n",
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"print(\"actual =\\n\", outputs_test)\n",
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"\n",
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"# Plot the predictions along with to the test data\n",
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"plt.clf()\n",
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"plt.title('Training data predicted vs actual values')\n",
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"plt.plot(inputs_test, outputs_test, 'b.', label='Actual')\n",
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"plt.plot(inputs_test, predictions, 'r.', label='Predicted')\n",
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"plt.show()"
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],
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"execution_count": 0,
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"outputs": []
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},
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{
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"cell_type": "markdown",
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"metadata": {
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"id": "j7DO6xxXVCym",
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"colab_type": "text"
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},
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"source": [
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"# Convert the Trained Model to Tensor Flow Lite\n",
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"\n",
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"The next cell converts the model to TFlite format. The size in bytes of the model is also printed out."
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]
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},
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{
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"cell_type": "code",
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"metadata": {
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"id": "0Xn1-Rn9Cp_8",
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"colab_type": "code",
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"colab": {}
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},
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"source": [
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"# Convert the model to the TensorFlow Lite format without quantization\n",
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"converter = tf.lite.TFLiteConverter.from_keras_model(model)\n",
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"tflite_model = converter.convert()\n",
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"\n",
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"# Save the model to disk\n",
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"open(\"gesture_model.tflite\", \"wb\").write(tflite_model)\n",
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" \n",
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"import os\n",
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"basic_model_size = os.path.getsize(\"gesture_model.tflite\")\n",
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"print(\"Model is %d bytes\" % basic_model_size)\n",
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" \n",
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" "
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],
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"execution_count": 0,
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"outputs": []
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},
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{
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"cell_type": "markdown",
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"metadata": {
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"id": "ykccQn7SXrUX",
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"colab_type": "text"
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},
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"source": [
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"## Encode the Model in an Arduino Header File \n",
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"\n",
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"The next cell creates a constant byte array that contains the TFlite model. Import it as a tab with the sketch below."
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]
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},
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{
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"cell_type": "code",
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"metadata": {
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"id": "9J33uwpNtAku",
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"colab_type": "code",
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"colab": {}
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},
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"source": [
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"!echo \"const unsigned char model[] = {\" > /content/model.h\n",
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"!cat gesture_model.tflite | xxd -i >> /content/model.h\n",
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"!echo \"};\" >> /content/model.h\n",
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"\n",
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"import os\n",
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"model_h_size = os.path.getsize(\"model.h\")\n",
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"print(f\"Header file, model.h, is {model_h_size:,} bytes.\")\n",
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"print(\"\\nOpen the side panel (refresh if needed). Double click model.h to download the file.\")"
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],
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"execution_count": 0,
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"outputs": []
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},
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{
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"cell_type": "markdown",
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"metadata": {
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"id": "1eSkHZaLzMId",
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"colab_type": "text"
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},
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"source": [
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"# Realtime Classification of Sensor Data on Arduino\n",
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"\n",
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"Now it's time to switch back to the tutorial instructions and run our new model on the [Arduino Nano 33 BLE Sense](https://www.arduino.cc/en/Guide/NANO33BLE)"
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]
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}
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]
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}

‎FruitToEmoji/README.md‎

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# FruitToEmoji
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Classifies fruit using the RGB color and proximity sensors of the Arduino Nano 33 BLE Sense, using a TensorFlow Lite Micro model trained on data captured from the same hardware
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