Function dump_session_ep_context 

pub fn dump_session_ep_context(
    model: &Model<'_>,
    orig_path: &Path,
    partitions: &[CompiledPartition<'_>],
    config: &EpContextDumpConfig,
) -> Result<PathBuf, SessionError>

Drive the §55.4 dump path: serialise model to a *_ctx.onnx context-cache model, replacing each compiled partition’s subgraph with a single com.microsoft::EPContext node.

For each partition the driver calls ExecutionProvider::save_context to obtain the runtime context (blob + ep_version) and takes the EP’s first declared ExecutionProvider::context_source_keys as the node’s source key (§55.6 — model-agnostic; no vendor name is hardcoded here). It then hands the neutral partition views to the loader-owned writer (onnx_runtime_loader::dump_ep_context). Returns the written model path.

If EpContextDumpConfig::enable is false this is a no-op: it does not call any EP’s save_context, writes no files, and returns the path it would have written to — so a disabled config has no side effects by construction.

Errors

• EpError::UnsupportedContext — an EP with no compile step (its save_context default).
• SessionError::Internal — an EP that participates in compilation but declares no source key (it cannot be dispatched on reload).
• loader errors from the writer (I/O, encoding).