README.md

---
dataset_info:
- config_name: reshaped
  features:
  - name: query
    dtype: string
  - name: image
    dtype: image
  - name: annot
    dtype: string
  - name: reasoning
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  - name: cate
    dtype: string
  - name: task
    dtype: string
  - name: metadata
    dtype: string
  splits:
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    num_examples: 493
  - name: test
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    num_examples: 138
  download_size: 2644093
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- config_name: scalogram
  features:
  - name: query
    dtype: string
  - name: image
    dtype: image
  - name: annot
    dtype: string
  - name: reasoning
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  - name: cate
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  - name: task
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  - name: test
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- config_name: spectrogram
  features:
  - name: query
    dtype: string
  - name: image
    dtype: image
  - name: annot
    dtype: string
  - name: reasoning
    dtype: 'null'
  - name: cate
    dtype: string
  - name: task
    dtype: string
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  - name: test
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    num_examples: 138
  download_size: 75605586
  dataset_size: 75997158.0
- config_name: waveform
  features:
  - name: query
    dtype: string
  - name: image
    dtype: image
  - name: annot
    dtype: string
  - name: reasoning
    dtype: 'null'
  - name: cate
    dtype: string
  - name: task
    dtype: string
  - name: metadata
    dtype: string
  splits:
  - name: train
    num_bytes: 20573590.0
    num_examples: 493
  - name: test
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    num_examples: 138
  download_size: 25890273
  dataset_size: 26329820.0
configs:
- config_name: reshaped
  data_files:
  - split: train
    path: reshaped/train-*
  - split: test
    path: reshaped/test-*
- config_name: scalogram
  data_files:
  - split: train
    path: scalogram/train-*
  - split: test
    path: scalogram/test-*
- config_name: spectrogram
  data_files:
  - split: train
    path: spectrogram/train-*
  - split: test
    path: spectrogram/test-*
- config_name: waveform
  data_files:
  - split: train
    path: waveform/train-*
  - split: test
    path: waveform/test-*
pretty_name: IMS/NASA-Bearing — Perception Representations (signal→VLM)
tags:
- bearing-fault-diagnosis
- vibration
- signal-to-image
- ims
- nasa
- run-to-failure
license: cc-by-4.0
task_categories:
- image-classification
---
# IMS / NASA-Bearing — perception representations (visual grounding)

The same IMS run-to-failure windows rendered as **perception** images — one HF **config** per representation, for the foundation model's visual grounding. Unlike the `IMS` (spectrum) repo, these are **not** for compute-then-check CoT (`reasoning` stays empty).

## Configs
```python
load_dataset("AI4Manufacturing/IMS-perception", "spectrogram")
```

| config | records | splits |
|---|---|---|
| `spectrogram` | 631 | {'train': 493, 'test': 138} |
| `scalogram` | 631 | {'train': 493, 'test': 138} |
| `waveform` | 631 | {'train': 493, 'test': 138} |
| `reshaped` | 631 | {'train': 493, 'test': 138} |

## Schema (7-field unified record)
| field | meaning |
|---|---|
| `query` | the classification instruction (representation-aware) |
| `image` | the rendered signal image (bytes embedded) |
| `annot` | gold fault class: normal / inner_race / outer_race / ball |
| `reasoning` | chain-of-thought (empty here; filled in the `-annotated` sibling) |
| `cate` / `task` | `C` / `T-C1` (signal fault classification) |
| `metadata` | JSON string: representation, set, timestamp, time_frac, channel, bearing, bearing_group, rpm, fs, fr_hz, features, fault_freqs, computed_verdict, computed_snr, evidence_tier, image_sha256, split |

## Provenance & reproducibility
Generated **deterministically** by `forge_agent/examples/ims/convert.py` (`5622dddd61`) → `forge_model/IMS/convert_ims.py` (`2fb49936b1`); see `provenance.json`.

**Gold = the documented end-state defect** (readme / manufacturer teardown): Set 1 → bearing 3 inner-race + bearing 4 roller(ball); Set 2 → bearing 1 outer-race; Set 3 → bearing 3 outer-race. `normal` = the early files of each run; `fault` = the late files of the failed bearing (per-set window from the degradation onset). A computed `evidence_tier` (confirmed/weak/absent) flags detectability.

## Caveats
- **Evidence-gated release — every image visibly supports its label.** IMS faults are WEAK run-to-failure signatures (the dataset's own reference paper, Qiu/Lee/Lin JSV 2006, studies *weak-signature detection*), so we curate by a computed `evidence_tier`: the **spectrum/reasoning** track keeps only `confirmed` records (the fault peak is actually present → faithful compute-then-check CoT); the **perception** tracks keep `confirmed`+`weak` and drop `absent`.
- **`inner_race` is EXCLUDED from this release.** IMS's Set-1 inner-race defect is a weak, multi-fault-mixed signature with too few detectable spectra to form a class (a handful of `confirmed` records). It is **retained in the raw form** (`evidence_tier` intact) for full transparency, but not published as a class. Published classes: **`normal` / `outer_race` / `ball`** — `outer_race` (Sets 2-3) is the clean, strong class; `ball` (Set-1 roller) is smaller and also weak.
- **Few distinct bearings** — each fault class comes from *one* run-to-failure bearing, so a strict bearing-wise split is impossible within a class; the split is file-stratified. Treat cross-bearing generalization claims with care.

## Source & license
Source: **IMS / NASA-Bearing** — NSF I/UCR Center for Intelligent Maintenance Systems (imscenter.net) with Rexnord Corp.; three test-to-failure runs on Rexnord ZA-2115 bearings at 2000 rpm. Reference: H. Qiu, J. Lee, J. Lin, *J. Sound and Vibration* 289 (2006) 1066–1090. Distributed via the NASA Prognostics Data Repository.