Recurrent Neural Networks: Classifying Diagnoses with Long Short-Term Memory

by Sophie TurolSeptember 7, 2016


When training a recurrent neural network, one can face a bunch of challenges. Long short-term memory networks (LSTM) can come to a rescue, proving to be effective for learning from sequence data. These networks can be applied for modeling varying length sequences and capturing long-range dependencies.

At the recent TensorFlow meetup in Los Angeles, the attendees learnt how to use an LSTM network for modeling clinic data.


Addressing the issues of training a model with RNN

Dave Kale started his session with an introduction to computational phenotyping, which is used in predictive diagnostics to analyze observable characteristics or traits of an organism. According to Dave, the problem resides in classifying the right diagnosis based on all the data available. He enumerated a number of classical solutions to classify diagnoses:

Dave explored recurrent neural networks (RNNs) as one more solution option. He also talked about the following challenges when training an RNN:

  • backpropagation (also known as the chain rule) through time
  • gradients vanish (or explode) in deep neural nets

Then, Dave moved on to long short-term neural networks (LSTM) as a means for addressing the vanishing gradient problem during training. He also demonstrated how target replication and auxiliary targets can help on the way.

Watch the video for more detail.



TensorFlow concepts

Sam Abrahams treated the audience to an introductory session on TensorFlow, answering the following questions:

  • What makes TensorFlow unique?
  • Where might the library be heading in the future?
  • What are the guts of TensorFlow?

In his talk, Sam mentioned TensorFlow serving and a distributed runtime. TensorFlow serving allows for running a server that helps to easily swap the models in / out or run online training. A distributed runtime enables users to run TensorFlow via computing resources from heterogeneous hardware in parallel with minimal changes to code.

When overviewing TensorFlow basics, Sam highlighted some of the core definitions and moved onto:

  • What data flow graph is and why using it
  • How to build a graph
  • TensorFlow placeholders and variables
  • Running a TensorFlow session

To get more detail, watch the video from the meetup below.


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Further reading


About the experts

Dave Kale is a fourth-year PhD student in Computer Science at the University of Southern California. He works on a variety of topics in machine learning, including deep learning, active learning, and time series analysis. Dave is affiliated with the Whittier Virtual PICU Lab of Children’s Hospital LA, where he previously worked as Lead Data Scientist. Dave is also a co-founder of the annual Meaningful Use of Complex Medical Data (MUCMD) Symposium, the pre-eminent forum for research on applying machine learning to clinical data.

Sam Abrahams is a freelance data scientist and engineer with a focus on machine learning, especially deep learning. He is able to quickly form strategies to answer business questions using available data, as well as make recommendations for further data collection. Sam has an experience in teaching technical concepts and communicating effectively to people of varied technical skill and knowledge.

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