milkyroad/D

Kaggle Cystoscopy Frames

Cystoscopic still frames (1 754 PNG, ~236 MB) sourced from a Kaggle dataset, organized by tissue type (HGC / LGC / NST / NTL) and imaging modality (WLI / NBI). Flattened into a single train split with one row per image; images are embedded in the Parquet shards as HF Image features.

Why no splits

This dataset ships one train split only. The original CSV splits leaked patients (19 of 21 train cases also appeared in val/test). Use the case_id column to build your own patient/case-grouped splits to prevent leakage.

Columns

Column	Type	Description
image	Image	Decoded PIL image (embedded bytes).
filename	string	Normalized disk name case_{cid:03d}_pt_{pt:03d}_frame_{frame:04d}_{tissue}.png.
case_id	int	Case identifier — use this for group-aware splitting.
imaging_type	string	WLI or NBI.
tissue_type	string	HGC / LGC / NST / NTL.
original_split	string	The leaky CSV sub_dataset value — kept for auditability only.

Tissue types

Tissue	Count
LGC	647
NST	504
HGC	469
NTL	134

22 unique case_ids.

Loading

from datasets import load_dataset
ds = load_dataset("milkyroad/D", split="train")
print(ds[0]["image"])      # PIL.Image
print(ds[0]["tissue_type"])

Group-aware split example

import random
from collections import defaultdict

ds = load_dataset("milkyroad/D", split="train")
cases = sorted({r["case_id"] for r in ds})
random.Random(42).shuffle(cases)
n_test, n_val = 2, 2
test_cases = set(cases[:n_test])
val_cases = set(cases[n_test:n_test + n_val])

train = ds.filter(lambda r: r["case_id"] not in test_cases and r["case_id"] not in val_cases)
val   = ds.filter(lambda r: r["case_id"] in val_cases)
test  = ds.filter(lambda r: r["case_id"] in test_cases)

Filename normalization

The original Kaggle dataset contained 8 different filename patterns. All have been normalized to a single consistent format:

case_{cid:03d}_pt_{pt:03d}_frame_{frame:04d}_{tissue}.png

Pattern	Original format	Count	Example
1	case_NNN_pt_NNN_frame_NNNN	1266	case_002_pt_003_frame_0009.png
2	case_NNN_pt_NNN_HLT__frame_NNNN	7	case_012_pt_001_HLT__frame_0025.png
3	case_NNN_pt_NNN_HLT_frame_NNNN	30	case_025_pt_004_HLT_frame_0000.png
4	cys_case_N_ptN_frame_NNNN	28	cys_case_1_pt1_frame_2311.png
5	cys_case_N_ptN_NNNN	262	cys_case_5_pt1_0055.png
6	cys_case_N_ptN_NNNN (copy)	4	cys_case_10_pt1_1644 (copy).png
7	cys_case_N_NNNN (no pt)	41	cys_case_7_0384.png
8	case_N_cys_ptN_NNNN	116	case_6_cys_pt1_0165.png

Normalization details:

• HLT annotation stripped — 37 files had HLT (hyperplasia) embedded in the filename; already classified as NST in metadata, so the annotation was removed.
• Pattern 7 (no pt) — 41 files had no patient number; assigned pt_000.
• "(copy)" suffix — 4 files had macOS Finder duplicate suffixes; stripped (no non-copy counterparts existed; images are unique).
• Tissue type in filename — 9 collision pairs existed where the same case/pt/frame had both cancer and non-cancer images; including {tissue} disambiguates them.

Notes

• Original splits leak patients. The CSV's sub_dataset column places 19 of 21 train cases also in val/test. original_split is preserved only for auditability; build your own case-level splits via case_id.