onnx-source-snapshot/docs/OpConventions.md

Operator Conventions

To maintain consistency in operator signatures, we use the following principles:

• All attribute names should be lower case and use underscores when it helps with readability
• Any input/output represented by a single letter is capitalized (i.e. X)
• Any input/output represented by a full word or multiple words is all lower case and uses underscores when it helps with readability
• Any input/output representing a bias tensor will utilize the name "B"
• Any input/output representing a weight tensor will utilize the name “W”
• “axes” is used when an input, output or attribute is representing multiple axes
• “axis” is used when an input, output or attribute is representing a single axis