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Deep Learning & Beyond AI F UN DAMEN TALS Nemanja Radojkovic - PowerPoint PPT Presentation

Sep 05, 2023 •367 likes •644 views

Deep Learning & Beyond AI F UN DAMEN TALS Nemanja Radojkovic Senior Data Scientist Brief history of Neural Networks 1958: Articial Neural Networks invented by psychologist Frank Rosenblatt, inspired by human perception processes. 1986:

  1. Deep Learning & Beyond AI F UN DAMEN TALS Nemanja Radojkovic Senior Data Scientist

  2. Brief history of Neural Networks 1958: Arti�cial Neural Networks invented by psychologist Frank Rosenblatt, inspired by human perception processes. 1986: Rumelhart, Williams and Hinton co-author a paper that popularizes the backpropagation algorithm . 2012: a convolutional neural network (CNN) called AlexNet wins the ImageNet 2012 Challenge. "Suddenly people started to pay attention, not just within the AI community but across the technology industry as a whole." ~ The Economist AI FUNDAMENTALS

  3. The building blocks Arti�cial neuron Human neuron Multiple inputs Multiple dendrites (inbound signal paths) Transfer and activation functions Nucleus (the processing unit) Single output Single axon (outbound signal path) AI FUNDAMENTALS

  4. The basic network structure AI FUNDAMENTALS

  5. The basic network structure - input layer AI FUNDAMENTALS

  6. The basic network structure - hidden layer AI FUNDAMENTALS

  7. The basic network structure - output layer AI FUNDAMENTALS

  8. How do we make them? # Import the necessary objects from Tensorflow from tensorflow.keras.models import Sequential from tensorflow.keras.layers import Dense # Initialize the sequential model model = Sequential() # Add the HIDDEN and OUTPUT layer, specify the input size and the activation function model.add(Dense(units=32, input_dim=64, activation='relu')) # relu = REctified Linear Unit model.add(Dense(units=3, activation='softmax')) # Prepare the model for training (multi-class classification problem) model.compile(optimizer='adam', loss='categorical_crossentropy', metrics=['accuracy']) AI FUNDAMENTALS

  9. Your turn! AI F UN DAMEN TALS

  10. Deep Learning AI F UN DAMEN TALS Nemanja Radojkovic Senior Data Scientist

  11. Deep Neural Networks: what are they? Shallow networks: 2-3 layers Deep Neural Networks ... ... 4+ layers ... ... 2 3 1 AI FUNDAMENTALS

  12. Types of DNNs: Feedforward Applications: General purpose. Weak spot: Images, text, time-series. AI FUNDAMENTALS

  13. Types of DNNs: Recurrent Applications: Speech T ext AI FUNDAMENTALS

  14. Types of DNNs: Convolutional Image/Video T ext AI FUNDAMENTALS

  15. Layers and layers 1. Dense: tensorflow.keras.layers.Dense Single-dimensional feature extraction, signal transformation. 2. Convolutional: tensorflow.keras.layers.Conv1D, Conv2D, ... Multi-dimensional, shift-invariant feature extraction, signal transformation. 3. Dropout: tensorflow.keras.layers.Dropout Over�tting prevention by randomly turning off nodes. 4. Pooling/sub-sampling: tensorflow.keras.layers.MaxPooling1D, MaxPooling2D, ... Over�tting prevention by sub-sampling. 5. Flattening: tensorflow.keras.layers.Flatten Converting multi-dimensional to single-dimensional signals AI FUNDAMENTALS

  16. Your �rst Deep Learning model from tensorflow.keras.models import Sequential from tensorflow.keras.layers import (Dense, Conv2D, MaxPooling2D, Flatten) # Initialize the model model = Sequential() # Create your 5-layer network (input specified implicitly with 1st layer) model.add(Conv2D(64, kernel_size=3, activation='relu', input_shape=(28,28,1))) model.add(MaxPooling2D(pool_size=(2, 2),strides=(2, 2))) model.add(Flatten()) model.add(Dense(10, activation='softmax')) # Set fitting hyper-parameters and compile the model model.compile(optimizer='adam', loss='categorical_crossentropy', metrics=['accuracy']) AI FUNDAMENTALS

  17. Let's practice! AI F UN DAMEN TALS

  18. Convolutional Neural Networks AI F UN DAMEN TALS Nemanja Radojkovic Senior Data Scientist

  19. Convolution Mathematical operation describing how signals are transformed by passing through systems of different characteristics. Inputs: 1. Input signal (video, audio...) 2. Transfer function of the processing system (lens, phone, tube...) Result: The processed signal Example: Simulating the "telephone voice" Convolution(raw audio, telephone system transfer function) AI FUNDAMENTALS

  20. Convolution on images: Kernels Convolution ~ Filtering Kernel = Filter ("lens") AI FUNDAMENTALS

  21. Example: Vertical edge detection AI FUNDAMENTALS

  22. The beauty of it all Traditional Computer Vision: Deterministic pre-processing and feature extraction, hard-coded by the Computer Vision engineer through hours and hours of experimentation with different approaches. Computer Vision, the Deep Learning Way: Get tons of labelled images and let the algorithm �nd the optimal kernels on its own. Kernels == feature extractors. Downside: Very data "hungry"! AI FUNDAMENTALS

  23. Let's practice! AI F UN DAMEN TALS

  24. Congratulations! AI F UN DAMEN TALS Nemanja Radojkovic Senior Data Scientist

  25. The journey has just begun! Data extraction Data wrangling Time series analysis ... AI FUNDAMENTALS

  26. Have fun learning! AI F UN DAMEN TALS

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