Probabilistic Graphical Models (PGMs) for Fraud Detection and Risk Analysis.

PGMs are generative models that are extremely useful to model stochastic processes. I shall talk about how fraud models, credit risk models can be built using Bayesian Networks. Generative models are great alternatives to deep neural networks, which cannot solve such problems. This talk focuses on Bayesian Networks, Markov Models, HMMs and their applications. Many areas of ML need to explain causality. PGMs offer nice features that enable causality explanations.

 
 

Outline/Structure of the Talk

The session shall talk about various applications followed by what is needed to acquire such skills and where to apply PGMs.

Learning Outcome

Attendees shall look at alternatives to deep learning.

Target Audience

Those in ML research, Fintech.

Prerequisites for Attendees

Python.

schedule Submitted 1 year ago

Public Feedback

comment Suggest improvements to the Speaker
  • Prachi Saraph
    By Prachi Saraph  ~  1 year ago
    reply Reply

    Hi Harish,

    Could you  please respond to following questions?

    • Any comments on which use case/ example would you be covering?Does the talk include demos?
    • Does the talk cover a generic approach that would work for multiple problems of a certain nature? 

     

    • Harish Kashyap K
      By Harish Kashyap K  ~  1 year ago
      reply Reply

      Hi Prachi,

      * Yes. A usecase will be to showcase a fraud model where we detect probability of fraud given credit card transactions. 

      * Yes again. The talk is generic approach that can work for any set of causal models.

       

       


  • Liked Dr. Dakshinamurthy V Kolluru
    keyboard_arrow_down

    Dr. Dakshinamurthy V Kolluru - ML and DL in Production: Differences and Similarities

    45 Mins
    Talk
    Beginner

    While architecting a data-based solution, one needs to approach the problem differently depending on the specific strategy being adopted. In traditional machine learning, the focus is mostly on feature engineering. In DL, the emphasis is shifting to tagging larger volumes of data with less focus on feature development. Similarly, synthetic data is a lot more useful in DL than ML. So, the data strategies can be significantly different. Both approaches require very similar approaches to the analysis of errors. But, in most development processes, those approaches are not followed leading to substantial delay in production times. Hyper parameter tuning for performance improvement requires different strategies between ML and DL solutions due to the longer training times of DL systems. Transfer learning is a very important aspect to evaluate in building any state of the art system whether ML or DL. The last but not the least is understanding the biases that the system is learning. Deeply non-linear models require special attention in this aspect as they can learn highly undesirable features.

    In our presentation, we will focus on all the above aspects with suitable examples and provide a framework for practitioners for building ML/DL applications.

  • Naoya Takahashi
    Naoya Takahashi
    Sr. researcher
    Sony
    schedule 1 year ago
    Sold Out!
    45 Mins
    Demonstration
    Intermediate

    In evolutionary history, the evolution of sensory organs and brain plays very important role for species to survive and prosper. Extending human’s abilities to achieve a better life, efficient and sustainable world is a goal of artificial intelligence. Although recent advances in machine learning enable machines to perform as good as, or even better than human in many intelligent tasks including automatic speech recognition, there are still many aspects to be addressed to bridge the semantic gap and achieve seamless interaction with machines. Auditory intelligence is a key technology to enable natural man machine interaction and expanding human’s auditory ability. In this talk, I am going to address three aspects of it:

    (1) non-speech audio recognition,

    (2) video highlight detection,

    (3) one technology to surpassing human’s auditory ability, namely source separation.

  • Liked Swapan Rajdev
    keyboard_arrow_down

    Swapan Rajdev - Conversational Agents at Scale: Retrieval and Generative approaches

    Swapan Rajdev
    Swapan Rajdev
    CTO
    Haptik
    schedule 1 year ago
    Sold Out!
    45 Mins
    Talk
    Beginner

    Conversational Agents (Chatbots) are machine learning programs that are designed to have conversation with a human to help them fulfill a particular task. In recent years people have been using chatbots to communicate with business, help get daily tasks done and many more.

    With the emergence of open source softwares and online platforms building a basic conversational agent has become easier but making them work across multiple domains and handle millions of requests is still a challenge.

    In this talk I am going to talk about the different algorithms used to build good chatbots and the challenges faced to run them at scale in production.

  • Liked Mahesh Balaji
    keyboard_arrow_down

    Mahesh Balaji - Deep Learning in Medical Image Diagnostics

    Mahesh Balaji
    Mahesh Balaji
    Sr. Director
    Cognizant
    schedule 1 year ago
    Sold Out!
    45 Mins
    Talk
    Intermediate

    Convolutional Neural Networks are revolutionizing the field of Medical Imaging analysis and Computer Aided Diagnostics. Medical images from X-Rays, CT, MRI, retinal scans to digitized biopsy slides are an integral part of a patient’s EHR. Current manual analysis and diagnosis by human radiologists, pathologists are prone to undue delays, erroneous diagnosis and can therefore benefit from deep learning based AI for quantitative, standardized computer aided diagnostic tools.

    In this session, we will review the state of the art in medical imaging and diagnostics, important tasks like classification, localization, detection, segmentation and registration along with CNN architectures that enable these. Further, we will briefly cover data augmentation techniques, transfer learning and walkthrough two casestudies on Diabetic Retinopathy and Breast Cancer Diagnosis. Finally, we discuss inherent challenges from sourcing training data to model interpretability.

  • Liked Dr. Rohit M. Lotlikar
    keyboard_arrow_down

    Dr. Rohit M. Lotlikar - The Impact of Behavioral Biases to Real-World Data Science Projects: Pitfalls and Guidance

    45 Mins
    Talk
    Intermediate

    Data science projects, unlike their software counterparts tend to be uncertain and rarely fit into standardized approach. Each organization has it’s unique processes, tools, culture, data and in-efficiencies and a templatized approach, more common for software implementation projects rarely fits.

    In a typical data science project, a data science team is attempting to build a decision support system that will either automate human decision making or assist a human in decision making. The dramatic rise in interest in data sciences means the typical data science project has a large proportion of relatively inexperienced members whose learnings draw heavily from academics, data science competitions and general IT/software projects.

    These data scientists learn over time that the real world however is very different from the world of data science competitions. In the real-word problems are ill-defined, data may not exist to start with and it’s not just model accuracy, complexity and performance that matters but also the ease of infusing domain knowledge, interpretability/ability to provide explanations, the level of skill needed to build and maintain it, the stability and robustness of the learning, ease of integration with enterprise systems and ROI.

    Human factors play a key role in the success of such projects. Managers making the transition from IT/software delivery to data science frequently do not allow for sufficient uncertainty in outcomes when planning projects. Senior leaders and sponsors, are under pressure to deliver outcomes but are unable to make a realistic assessment of payoffs and risks and set investment and expectations accordingly. This makes the journey and outcome sensitive to various behavioural biases of project stakeholders. Knowing what the typical behavioural biases and pitfalls makes it easier to identify those upfront and take corrective actions.

    The speaker brings his nearly two decades of experience working at startups, in R&D and in consulting to lay forth these recurring behavioural biases and pitfalls.

    Many of the biases covered are grounded in the speakers first-hand experience. The talk will provide examples of these biases and suggestions on how to identify and overcome or correct for them.

  • Liked Harish Kashyap K
    keyboard_arrow_down

    Harish Kashyap K / Ria Aggarwal - Probabilistic Graphical Models, HMMs using PGMPY

    90 Mins
    Workshop
    Intermediate

    PGMs are generative models that are extremely useful to model stochastic processes. I shall talk about how fraud models, credit risk models can be built using Bayesian Networks. Generative models are great alternatives to deep neural networks, which cannot solve such problems. This talk focuses on Bayesian Networks, Markov Models, HMMs and their applications. Many areas of ML need to explain causality. PGMs offer nice features that enable causality explanations. This will be a hands-on workshop where attendees shall learn about basics of graphical models along with HMMs with the open source library, pgmpy for which we are contributors. HMMs are generative models that are extremely useful to model stochastic processes. This is an advanced area of ML that is helpful to most researchers and ML community who are looking for solutions in state-space problems. This workshop shall have students learn basics needed to learn about HMMs including advanced probability, generative models, markov theory and HMMs. Students shall build various interesting models using pgmpy.

  • Liked Anuj Gupta
    keyboard_arrow_down

    Anuj Gupta - Sarcasm Detection : Achilles Heel of sentiment analysis

    Anuj Gupta
    Anuj Gupta
    Scientist
    Intuit
    schedule 1 year ago
    Sold Out!
    45 Mins
    Talk
    Intermediate

    Sentiment analysis has been for long poster boy problem of NLP and has attracted a lot of research. However, despite so much work in this sub area, most sentiment analysis models fail miserably in handling sarcasm. Rise in usage of sentiment models for analysis social data has only exposed this gap further. Owing to the subtilty of language involved, sarcasm detection is not easy and has facinated NLP community.

    Most attempts at sarcasm detection still depend on hand crafted features which are dataset specific. In this talk we see some of the very recent attempts to leverage recent advances in NLP for building generic models for sarcasm detection.

    Key take aways:
    + Challenges in sarcasm detection
    + Deep dive into a end to end solution using DL to build generic models for sarcasm detection
    + Short comings and road forward

  • Liked Dr. Arun Verma
    keyboard_arrow_down

    Dr. Arun Verma - Extracting Embedded Alpha Factors From Alternative Data Using Statistical Arbitrage and Machine Learning

    45 Mins
    Case Study
    Intermediate

    The high volume and time sensitivity of news and social media stories requires automated processing to quickly extract actionable information. However, the unstructured nature of textual information presents challenges that are comfortably addressed through machine learning techniques.

  • Liked Tamaghna Basu
    keyboard_arrow_down

    Tamaghna Basu - Killing the Password via Gesture Recognition

    Tamaghna Basu
    Tamaghna Basu
    CTO
    neoEYED Inc
    schedule 1 year ago
    Sold Out!
    20 Mins
    Talk
    Intermediate

    We are living in times where we still have to type the password. NeoEyed's gesture recognition is able to detect swipes to authenticate the user to provide access to the mobile. This is a non-trivial problem as many users can have similar gestures. It is important that the classifiers are able to detect fine changes between many users who could potentially break into the phone. We shall talk about how various classifiers are used for such a detection. We shall talk about classifiers such as one-class SVM, multi-level robust classifiers which are useful for this scenario. Our detection mechanism won us the "Paypal Award". We are now building the next generation authentication system for which we shall discuss the technologies and challenges that need to be resolved.

    The talk shall be organized as:

    1. The problem we are trying to solve. 3

    2. What classifiers help in such a scenario. 10

    3. Challenges in existing out of box methods 3.

    4. What directions are helping us. 4

  • Liked joydeep bhattacharjee
    keyboard_arrow_down

    joydeep bhattacharjee - Cutting edge NLP with fastText

    45 Mins
    Talk
    Intermediate

    FastText has been open-sourced by Facebook in 2016 and with its release, it became the fastest and most cutting edge library for text classification and word representation. It includes the implementation of two extremely important methodologies in NLP i.e Continuous Bag of Words and Skip-gram model. FastText performs exceptionally well with supervised as well as unsupervised learning.