TensorFlow: Biology’s Gateway to Deep Learning?

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TensorFlow: Biology’s Gateway to Deep Learning? Ladislav Rampasek, Anna Goldenberg  Cell Systems  Volume 2, Issue 1, Pages 12-14 (January 2016) DOI: 10.1016/j.cels.2016.01.009 Copyright © 2016 Elsevier Inc. Terms and Conditions

Figure 1 An Example of a Feed-Forward Neural Network with Two Hidden Layers The left panel depicts a diagram of the neural network. The right panel shows the corresponding TensorFlow computational graph as a screenshot of the TensorBoard tool, the graphical part of the TensorFlow package. This neural network takes a vector x=(x1,x2) as the input. The values (units) in the first hidden layer are computed as a non-linear function of a weighted linear combination of the inputs, e.g. h1(1)=max(0,w1,1(1)x1+w1,2(1)x2+b1(1)). In the TensorBoard visualization, this computation is expressed in terms of matrices (tensors) as h(1)=max(0,W(1)x+b(1)). The non-linearity used here is the so-called rectifier function, Relu(x)=max(0,x). The second hidden layer is computed analogously. Note that, in practice, neural networks can consist of many layers of different types (such as convolutional or pooling layers) with several thousand units each. The visualization of the graph structure in TensorBoard is interactive, enabling both compact and detailed representation of the underlying computations. Here, details of the computation in the first hidden layer are shown, whereas details of the computations in the other layers or functions are compressed and shown as single nodes. Cell Systems 2016 2, 12-14DOI: (10.1016/j.cels.2016.01.009) Copyright © 2016 Elsevier Inc. Terms and Conditions