Equation 2 · Part 1 · Probing, Sparse Autoencoders, Patching, and Steering: The Main Interpretability Methods, Compared
Symbol h_ell
What this part means
the frozen activation the network produces at layer for input x , and w.
Its job in the formula
ll is a part of this expression. Its role is fixed by the surrounding article and by the operations shown in the formula.
Full expression→Symbol h_ell→Article meaning
Where the article explains it
where is the frozen activation the network produces at layer for input x , and w, b are the probe’s own parameters, trained on labelled examples the network never saw during its own training.
The passage around this formula
where is the frozen activation the network produces at layer for input x , and w, b are the probe’s own parameters, trained on labelled examples the network never saw during its own training. Nothing in that objective touches the network’s weights or its downstream computation. A probe reports only whether some linear function of this one activation predicts the label well.
Learn the underlying idea
A subscript is a label attached below a symbol. It often selects a time step, component, category, or member of a sequence.
Open the illustrated subscripts: which member of a family? guide →
See this notation across published equations →
Sources cited in the article section
- [1] Understanding Intermediate Layers Using Linear Classifier Probes ↗
- [2] What You Can Cram into a Single Vector: Probing Sentence Embeddings for Linguistic Properties ↗
- [3] Designing and Interpreting Probes with Control Tasks ↗
- [4] Probing Classifiers: Promises, Shortcomings, and Advances ↗
These citations provide research context; check each source for the exact claim it supports.