Remove stale step() docstring from DeepSpeedCPUAdam (#8011)
## What
Removes an obsolete paragraph from the `DeepSpeedCPUAdam` constructor
docstring.
## Why
The docstring described a `step()` option that "updates optimizer states
and
copies the parameters back to GPU at the same time" — the old
`adam_update_copy`
kernel, invoked via `step(fp16_param_groups=...)`. That fused-copy path
no longer
exists in the codebase:
- `csrc/adam/cpu_adam.cpp` binds only `adam_update` (no
`adam_update_copy`).
- `DeepSpeedCPUAdam.step()` / `step_subgroup()` take no
`fp16_param_groups`
argument and only call `adam_update`.
So the "two options" text is stale and misleading to anyone reading the
API.
Docstring-only change; no functional impact.
🤖 Generated with [Claude Code](https://claude.com/claude-code)
Signed-off-by: Lucas Pirola <lucas@pirola.eu>
Co-authored-by: Claude Opus 4.7 <noreply@anthropic.com>
