cityscapes/singletask_learning_bench: broken config paths (missing semantic-segmentation/ segment) block execution, no README

[karanthengane23]

1. Background

examples/cityscapes/singletask_learning_bench benchmarks RFNet semantic segmentation under the singletasklearning paradigm on the Cityscapes dataset. All example files actually live under a semantic-segmentation/ subdirectory, but three config files reference each other without that path segment:

• semantic-segmentation/benchmarkingjob.yaml → testenv: "./examples/cityscapes/singletask_learning_bench/testenv/testenv.yaml" (missing semantic-segmentation/)
• same file → algorithm url: "./examples/cityscapes/singletask_learning_bench/testalgorithms/rfnet/rfnet_algorithm.yaml" (same problem)
• semantic-segmentation/testenv/testenv.yaml → metric url: "./examples/cityscapes/singletask_learning_bench/testenv/map.py" (same problem)

Running it reproduces the crash immediately, before any model/data code executes:

RuntimeError: not found testenv config file(./examples/cityscapes/singletask_learning_bench/testenv/testenv.yaml) in local.

The example also has no README at all — unlike working examples (e.g. pcb-aoi), which document dataset source and quick-start steps.

2. Goals

• Fix the three path references so ianvs -f gets past config loading.
• Add a README documenting the Cityscapes dataset source and how to run this example, matching the convention used by verified-runnable examples.

3. Scope

This is distinct from the hardcoded-developer-machine-path bugs already tracked in #440/#515/#436 — those are absolute paths baked in from someone's own machine (e.g. /home/xiebo/...). This is a structural bug in the repo's own relative paths (a missing directory segment), affecting every config file in this example. No open PR currently touches this example.

4. Detailed design

• Architecture: affects Ianvs's Test-Environment Manager (loads testenv.yaml) and Test-Case Controller (loads the algorithm YAML) — both fail at config-parsing time, before reaching core's actual paradigm/model code.
• Module details: no core changes needed — purely fixing the url/testenv string values in the three YAML files to include the semantic-segmentation/ segment, plus adding the missing README.

I'll follow this up with a PR shortly.

[karanthengane23]

/assign