_index.org

Hidden Markov Model

Last edited: August 8, 2025
  1. draw an initial state \(q_1\) from the initial state distribution \(\pi\)
  2. For each state \(q_{i}\)…
    1. Drew observe something \(o_{t}\) according to the action distribution of state \(q_{i}\)
    2. Use transition probability \(a_{i,j}\) to draw a next state \(q_{j}\)

Isolated recognition: train a family of HMMs, one for each word or something. Then, given new data, perform scoring of the HMM onto the features.

components of HMMs

scoring

Given an observation \(o_1, …, o_{T}\) and a model, we compute $P(O | λ)$—the probability of a sequence given a model \(\lambda\)

Hierarchical Multi-Label Clsf. for Vaccine

Last edited: August 8, 2025

Misinformation can decline people’s intent to vaccinate.

Data

VaxConcerns Taxonomy: sorting misinformation into a taxonomy which has multiple, hierarchical labels

So, you can classify a label in a bunch of places.

Approaches

Ask an LLM to do one of the following…

One-Shot, Multi-Label

Ignore hierchy, just go do multi label system

multi-pass, hierarchical label

try to predict groups at a time, each pass has a label group as input and needs to produce whether the label is given + sublabels

high chemical activity

Last edited: August 8, 2025

a monomer is named active if it recruits its neighbors to make a polymer that can act as an enzyme to catalyze other monomers to become active as well

Hindsight Optimization

Last edited: August 8, 2025

If we are tele-operating a robot, we ideally want to minimize cost. We want to estimate a user’s goal via user inputs. Predict the most likely goal + assist for it.

“find a cost function for which user input \(u\) is optimal”.

  • system does not know the goal
  • the user may not change their goal on a whim

Hindsight Optimization

To solve this, we use QMDP: “select the most optimal actions to estimating cost-to-go assuming full observability”.

history and impact of decision making

Last edited: August 8, 2025

history

economics

  • utility theory

psychology

neuroscience

  • bio-simulated things

computer science

  • how “systems composed of matter can have properties of the mind

engineering

  • control theory

maffs

operations research

societal impact

  • classes can help amplify intention (whether good or evil)
  • data-driven methods