Explainable AI: Bias, Trust, and Law

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Questions and Answers

What is a primary reason for needing explanations in machine learning?

  • To decrease the computational complexity of the algorithms.
  • To validate the logic of models and ensure they are not making decisions based on spurious correlations or biases. (correct)
  • To make the models more opaque and harder to understand for competitive advantage.
  • To reduce the amount of training data required for the models.

Which of the following is a potential consequence of using machine learning algorithms without understanding their decision-making process?

  • Enhanced model generalization across different datasets.
  • Increased trust and adoption of AI systems regardless of their accuracy.
  • Perpetuation of biases present in the training data, leading to unfair or discriminatory outcomes. (correct)
  • Reduction in the risk of adversarial attacks due to model opacity.

The EU's General Data Protection Regulation (GDPR) includes which provision related to explainability?

  • A requirement to use only white box models in automated decision-making.
  • Mandatory disclosure of all training data used for machine learning models.
  • The 'right to an explanation,' providing users with meaningful information about the logic involved in automated decisions. (correct)
  • The 'right to be forgotten,' ensuring data is permanently deleted upon request.

In the context of Fairness, Accountability, and Transparency in Machine Learning (FAT/ML), what does explainability ensure?

<p>That algorithmic decisions and the data driving those decisions can be understood by end-users and stakeholders in accessible terms. (C)</p> Signup and view all the answers

According to DARPA, which question does Explainable Artificial Intelligence (XAI) aim to answer?

<p>How do I correct an error? (C)</p> Signup and view all the answers

Which of the following is NOT a primary benefit of machine learning explanations?

<p>Increasing model complexity for better performance. (C)</p> Signup and view all the answers

Which factor contributes to the difficulty of achieving explainability in machine learning?

<p>Model complexity, where intricate interactions between input variables make it challenging to explain the output. (C)</p> Signup and view all the answers

What is a key limitation of using inherently interpretable models, such as decision trees, for complex problems?

<p>Their explanations don't scale. (A)</p> Signup and view all the answers

What distinguishes white box models from black box models?

<p>The structure of a white box model represents the explanation, whereas black box models hide how they arrive at decisions. (C)</p> Signup and view all the answers

What is the primary goal of Local Explanation methods?

<p>To explain a single prediction by focusing on the relevant part. (A)</p> Signup and view all the answers

How do post-hoc explanation methods work?

<p>By creating a surrogate model to approximate the black box model, then interpreting the substitute. (B)</p> Signup and view all the answers

What is LIME primarily used for?

<p>Approximates an underlying machine learning model. (B)</p> Signup and view all the answers

Which of the following best describes LIME (Local Interpretable Model-Agnostic Explanations)?

<p>A tool for approximating any machine learning model with a local, interpretable model to explain individual predictions. (A)</p> Signup and view all the answers

What is a potential drawback of LIME?

<p>It assumes local linearity, which may not always hold true. (A)</p> Signup and view all the answers

Which statement is true about LIME?

<p>Misleading LIME explanations can be used to fool users trusting a biased classifier. (D)</p> Signup and view all the answers

What theoretical concept is SHAP based on?

<p>Cooperative game theory. (D)</p> Signup and view all the answers

What does the 'dummy' axiom in Shapley Value theory state?

<p>A player who never contributes to the game must receive zero attribution. (C)</p> Signup and view all the answers

What does SHAP stand for?

<p>SHapley Additive exPlanations. (C)</p> Signup and view all the answers

In the context of SHAP, what is the purpose of feature attribution?

<p>To assign a contribution value to each feature, indicating its impact on the model's prediction. (D)</p> Signup and view all the answers

Which of the following models is directly supported by the TreeExplainer in SHAP?

<p>XGBoost. (D)</p> Signup and view all the answers

For which type of models is DeepExplainer used within the SHAP framework?

<p>Deep learning models. (D)</p> Signup and view all the answers

What is a key characteristic of KernelExplainer (Kernel SHAP)?

<p>It is model agnostic. (B)</p> Signup and view all the answers

What is the primary purpose of force plots?

<p>To explain the prediction of individual instances by showing how each feature contributes to pushing the prediction away from the base value. (B)</p> Signup and view all the answers

In SHAP, what do dependence plots illustrate?

<p>The relationship between a feature's value and its SHAP value. (B)</p> Signup and view all the answers

What information is conveyed by summary plots?

<p>The importance and directional impact of each feature on the model output. (A)</p> Signup and view all the answers

How does SHAP handle feature interactions?

<p>Through pairwise interaction values that quantify the combined effect of two features. (B)</p> Signup and view all the answers

Which of the following is a known advantage of using SHAP values for explaining machine learning models?

<p>Comes with a lot of visualization plots. (B)</p> Signup and view all the answers

Which of the following statements is true regarding Kernel SHAP?

<p>It incorporates LIME into its. (C)</p> Signup and view all the answers

What is a potential challenge or drawback of using SHAP values?

<p>They can be computationally expensive to run. (C)</p> Signup and view all the answers

Why is explainability important in machine learning, particularly in high-stakes decisions?

<p>Because it builds trust in AI systems. (D)</p> Signup and view all the answers

Which of the following statements describes a key consideration when choosing between different explainability methods like LIME and SHAP?

<p>The choice depends on the specific requirements of the task, the type of model being explained, and the desired level of detail in the explanation. (C)</p> Signup and view all the answers

How do machine learning models learn decision models?

<p>By learning decision models based on historical data. (D)</p> Signup and view all the answers

What is a potential outcome if machine learning models replicate 'historical biases'?

<p>Penalizing applicants for attending an all-women's college or participating in a women's chess club. (A)</p> Signup and view all the answers

According to the US Equal Credit Opportunity Act 1974, what are credit agencies required to do?

<p>Provide the main factors determining credit score. (A)</p> Signup and view all the answers

What is the aim of data scientists, developers, and product owners with Explainable AI?

<p>Ensure/improve product efficiency, research, new functionalities. (C)</p> Signup and view all the answers

What are two regulatory compliances mentioned in the lecture?

<p>US Equal Opportunity Act and EU GDPR. (D)</p> Signup and view all the answers

What is a key reason machine learning algorithms are vulnerable to adversarial attacks, such as one-pixel attacks?

<p>Machine learning models learn complex functions that can be subtly manipulated by minimal input changes that humans might not notice. (D)</p> Signup and view all the answers

Why might a health outcome prediction model based on X-ray images, without explainability, result in the 'right' prediction for the wrong reason?

<p>The model may be learning to associate health outcomes with the type of X-ray unit rather than actual health indicators. (A)</p> Signup and view all the answers

How can explainability help in defending against adversarial attacks on machine learning models?

<p>By providing insights into the model's decision-making process, making it easier to identify and counteract subtle manipulations. (C)</p> Signup and view all the answers

What is the potential consequence of machine learning models learning and replicating 'historical biases'?

<p>The model may perpetuate unfair or discriminatory outcomes, particularly against certain demographic groups. (D)</p> Signup and view all the answers

What does algorithmic transparency ensure in the context of Fairness, Accountability, and Transparency in Machine Learning (FAT/ML)?

<p>It means that algorithmic decisions and the data driving them can be explained to end-users and other stakeholders in non-technical terms. (A)</p> Signup and view all the answers

According to DARPA, what is a central question that Explainable Artificial Intelligence (XAI) seeks to address when deploying AI systems?

<p>How can we enable AI systems to justify their decisions and actions in a way that humans can understand? (D)</p> Signup and view all the answers

How might validating the logic of a machine learning model using explainability techniques contribute to model improvement?

<p>It helps confirm the model's processing aligns with expected behavior, identifying potential errors or biases. (B)</p> Signup and view all the answers

Why is model complexity a key factor that contributes to the difficulty of achieving explainability in machine learning?

<p>Complex models often establish intricate interactions between input variables, making it hard to describe the output in terms understandable to a human. (B)</p> Signup and view all the answers

Why do interpretable models, like decision trees, face scalability challenges when applied to complex problems?

<p>As complexity increases, their structure tends to become too intricate for easy human comprehension. (B)</p> Signup and view all the answers

What is a primary characteristic that distinguishes 'White Box' models from 'Black Box' models?

<p>White box models have a transparent structure that directly represents the explanation of their decision making; black box models do not. (B)</p> Signup and view all the answers

What is the core principle behind Local Explanation methods in explainable AI?

<p>To approximate the behavior of a complex model with a simpler, interpretable model in a specific region of the input space. (C)</p> Signup and view all the answers

How do Post-Hoc explanation methods work in machine learning?

<p>By training a secondary, interpretable model to approximate the behavior of a pre-existing 'black box' model. (A)</p> Signup and view all the answers

Why might a misleading explanation from a machine learning model using LIME lead to negative outcomes?

<p>Users may be misled into blindly trusting a flawed or biased classifier due to believing the provided local explanation. (A)</p> Signup and view all the answers

LIME is considered computationally expensive because it...

<p>Requires a large number of samples around the instance being explained to generate explanation. (A)</p> Signup and view all the answers

A key limitation of LIME is that it assumes local linearity, meaning...

<p>The relationship between features and the outcome of the model can be accurately represented by a straight line in the vicinity of the instance being explained. (D)</p> Signup and view all the answers

In the context of cooperative game theory, what does SHAP considers as 'players'?

<p>The input features of the machine learning model. (B)</p> Signup and view all the answers

What does the 'efficiency' axiom in Shapley Value theory state regarding feature attribution?

<p>Feature attributions must add up to the total prediction. (A)</p> Signup and view all the answers

What kind of models is TreeExplainer is optimized to explain?

<p>Tree-based ensemble models (D)</p> Signup and view all the answers

For what type of models is DeepExplainer primarily designed?

<p>Deep learning models (A)</p> Signup and view all the answers

What is a key characteristic of KernelExplainer in SHAP?

<p>It is model-agnostic and approximates the Shapley values using a combination of LIME and Shapley values. (B)</p> Signup and view all the answers

What do force plots in SHAP primarily visualize?

<p>The individual feature contributions to a single prediction. (A)</p> Signup and view all the answers

What information do dependence plots in SHAP communicate?

<p>The relationship between feature values and their corresponding SHAP values. (B)</p> Signup and view all the answers

What is the purpose of summary plots in SHAP?

<p>To present an overview of feature importance and their impact on the model output. (C)</p> Signup and view all the answers

Why is it not recommended to consider Kernel SHAP as a direct alternative to LIME?

<p>Kernel SHAP incorporates LIME into its logic, making it an extension rather than a substitute. (A)</p> Signup and view all the answers

What is one key advantage of using SHAP values for explaining machine learning models?

<p>SHAP values provide a unified framework based on game theory, offering a more principled and consistent approach to feature attribution. (D)</p> Signup and view all the answers

Flashcards

Explainable AI (XAI)

The ability to understand and explain how machine learning models make decisions, ensuring transparency and trust.

Right for the Wrong Reason

A situation where models learn and make predictions based on irrelevant or incorrect features, leading to poor generalization.

Adversarial Attacks

A technique where slight modifications to input data can cause machine learning models to make incorrect predictions.

ML Algorithm Bias

Situation where machine learning algorithms produce biased or unfair outcomes due to biased training data or flawed design.

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Equal Credit Opportunity Act 1974

A US law requiring credit agencies to disclose the main factors determining an individual's credit score.

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GDPR 2018

An EU regulation that includes the 'right to an explanation,' providing users with meaningful information about automated decisions.

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Explainability (FAT/ML)

Algorithmic decisions and the data driving them should be understandable to end-users and stakeholders in non-technical terms.

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White Box Models

Models whose internal structure and decision-making processes are easily understood and interpretable.

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Black Box Models

Models whose internal workings are opaque and difficult to interpret.

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Local Explanation

Explaining a model's prediction by approximating it locally with a simpler, interpretable model.

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Post-Hoc Explanations

Explaining a model's prediction after the model has been trained, without changing the model itself.

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LIME

A method that approximates complex models locally with linear models to explain individual predictions.

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LIME Perturbation

Perturbing the sample around the instance.

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SHAP

A framework that uses Shapley values from game theory to explain the output of any machine learning model.

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Shapley Value

A concept from cooperative game theory that assigns each player a value equal to their average marginal contribution to all possible coalitions.

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Shapley Value Axioms

Axioms that define the Shapley value, ensuring fairness and efficiency in attributing contributions.

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TreeExplainer

Compute the SHAP value for tree based models.

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DeepExplainer

Compute the SHAP value for deep learning models.

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KernelExplainer

SHAP values calculated using a combination of LIME and Shapley values, providing model-agnostic explanations.

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Force Plots

Visualizations showing how each feature contributes to the prediction for a single instance.

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Dependence Plots

Plots showing how a feature's value affects the SHAP value of the prediction.

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Summary Plot

SHAP values (impact on model output).

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Study Notes

Explainable AI (XAI)

  • Machine learning (ML) explanations are important to validate logic in models
  • ML explanations help in defending against adversarial attacks, detecting bias, ensuring regulatory compliance, and debugging models
  • Explainability ensures trust, which leads to adoption.

Why do We Need Machine Learning Explanations?

  • ML algorithms can be biased
  • ML algorithms are vulnerable to adversarial attacks
  • ML algorithms can be easily fooled

Examples of Bias in Machine Learning:

  • COMPAS (Correctional Offender Management Profiling for Alternative Sanctions) is an example of a biased machine learning algorithm
  • Amazon scrapped an AI recruiting tool because it showed bias against women and penalizing applicants for attending women's college or participating in women's chess clubs.

Explainability and the Law

  • US Equal Credit Opportunity Act of 1974 requires credit agencies to provide the main factors determining credit score
  • EU General Data Protection Regulation (GDPR) 2018 provides a "Right to an explanation", giving users information about the logic involved in automated decisions

Explainable AI (XAI) Defined

  • XAI ensures that algorithmic decisions and the data driving those decisions can be explained to end-users and stakeholders in non-technical terms
  • DARPA poses key questions for XAI, including "Why did you do that?", "Why not something else?", and "When can I trust you?"

Target Audience

  • XAI is targeted towards domain experts/users, those affected by model decisions, regulatory entities/agencies, managers and executive board members, and data scientists/developers/product owners

Explainability Challenges

  • Achieving explainability in ML is difficult due to model complexity
  • ML methods learn complex functions, making it difficult to explain output as a function of the input
  • Interpretable models may not scale
  • The multiplicity of good models makes it difficult
  • GPT-3, OpenAI's Natural Language Processing Model has 175,000,000,000 parameters

Explainability Options

  • White Box Models: Self-explanatory, interoperable output
  • Black Box Models: Map user features into a decision class without exposing the how and why they make decisions
  • Local Explanation involves only a small piece of complexity
  • Post-Hoc Explanations interprets and generates explanations from surrogate models

LIME (Local Interpretable Model-Agnostic Explanations)

  • LIME approximates an underlying function
  • LIME is widely cited, easy to understand and easy to implement
  • Cons of LIME; Assumes local linearity, is computationally expensive, requires a large number of samples, and is not stable
  • A LIME misleading explanation can fool users into trusting a biased classifier
  • KernelExplainer (Kernel SHAP) uses a combination of LIME and Shapley values

SHAP (SHapley Additive exPlanations)

  • SHAP aims to explain predictions of individual instances using force plots
  • Shapley Value is a concept from cooperative game theory where members receive proportional payments or shares to their marginal contributions
  • SHAP value axioms: Dummy, Symmetry, Efficiency and Additivity
  • Compute SHAP values for trees and ensembles of trees
  • Compute SHAP values for deep learning models

SHAP Explainers

  • TreeExplainer; Supports XGBoost, LightGBM, CatBoost, and other tree-based models like Random Forest.
  • DeepExplainer; Supports TensorFlow and Keras models, using DeepLIFT and Shapley values.
  • GradientExplainer; Supports TensorFlow and Keras models.
  • KernelExplainer (Kernel SHAP); Model agnostics and uses a combination of LIME and Shapley values

Visualizations

  • Force Plots (Single Instance and Entire Dataset)
  • Dependence Plots
  • Summary Plots
  • Interaction Values

SHAP Pros and Cons

  • SHAP is widely cited, based on theory, and easy to implement
  • It comes with a lot of visualization plots
  • SHAP supports useful visualization charts, is based on game theory, but expensive to run
  • SHAP incorporates LIME into its logic

Reading List

  • "Why should I trust you?: Explaining the predictions of any classifier."
  • "A Unified Approach to Interpreting Model Predictions"
  • Data Camp Article - "An Introduction to SHAP Values and Machine Learning Interpretability"
  • Data Camp – "Explainable Artificial Intelligence (XAI)"

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