map
People say map to mean a picture that shows places and how to get between them. They also use it as a verb meaning to figure out where something belongs or how one thing lines up with another.
What a model may hear
- key-value store computer science, programming
- assume a data structure that pairs keys with values for fast lookup
- higher-order function functional programming
- apply a function to every element in a list or collection and return the results
- memory-mapped file or region operating systems
- treat a file or device as if it were part of RAM, enabling direct byte access
- graph or hash table algorithms
- model a problem as a set of nodes and edges, or use hashing for O(1) access
- coordinate transformation graphics, GIS, machine learning
- project data from one space to another, like lat-long to pixels or feature vectors to latent space
Where people and models part ways
“Map this data for me”
Meant: Make a visual chart or diagram
May be taken as: Apply a function element-wise or build a hash table
Say instead: “Create a visual map or chart of this data”
“Put it on the map”
Meant: Make it visible or important
May be taken as: Write it to a memory-mapped region or insert into a key-value store
Say instead: “Make this prominent or well-known”
“Map out the plan”
Meant: Explain the steps clearly
May be taken as: Generate a formal graph structure or state machine
Say instead: “Outline the steps clearly in words”
“The results don't map to what I expected”
Meant: They don't match or correspond
May be taken as: The function returned wrong outputs or the hash lookup failed
Say instead: “The results don't correspond to what I expected”
Tips
- Say 'visual map' or 'chart' when you want a picture, not a data structure
- Say 'apply to each' or 'transform each element' instead of 'map' for list operations
- Say 'corresponds to' or 'matches' when you mean alignment, not key lookup
- Specify 'geographic map' or 'street map' to avoid confusion with data structures
- Avoid 'map' as a verb with models unless you mean the technical function
Often confused with
- reduce
- combines values into one result, not one-to-one transformation
- filter
- selects subset of elements, does not transform them
- plot
- always means visual graph, never a data structure
- dictionary
- same data structure, but said in Python; 'map' is Java/C++
- transform
- general change of form, not specifically element-wise function application
- hash
- focuses on the hashing mechanism, not the key-value pairing itself