Datasets:

Real-IAD
/

Real-IAD_Variety

Modalities:

Corrupt deflate streams in 23 of 35 realiadvariety_raw/*.zip (201/111673 entries, 21 orphan masks)

by zhangBeiQing - opened 14 days ago

Summary

201 of 111,673 entries (0.180%) across 23 of the 35 realiadvariety_raw/*.zip archives cannot be extracted: their compressed data fails to inflate with a CRC error. The entries are listed in the archive central directory, but the deflate stream is corrupt.

This does not look like a download problem on our side — see the size verification below. We suspect the corruption is present in the uploaded archives themselves.

Evidence

1. Two independent tools agree on the same files.

Info-ZIP unzip 6.00:

error:  invalid compressed data to inflate .../3pin_aviation_connector/NG/Abrasion/S0045/3pin_aviation_connector__0045_NG_Abrasion_C5_20240609164648698.png
file #41:  bad zipfile offset (local header sig):  60931093

Python 3.12 zipfile.ZipFile.testzip() (which verifies CRC for every entry) returns the same first bad file:

>>> zipfile.ZipFile('3pin_aviation_connector.zip').testzip()
'NG/Abrasion/S0045/3pin_aviation_connector__0045_NG_Abrasion_C5_20240609164648698.png'

2. Our downloads are byte-complete, so this is not truncation.

Every one of the 35 archives matches the size reported by the Hub API exactly:

archive	Hub size (bytes)	local size (bytes)
`3pin_aviation_connector.zip`	5158789405	5158789405
`charging_port.zip`	911507602	911507602
`hall_effect_sensor.zip`	404238082	404238082
`multi_function_switch.zip`	632234470	632234470
`slide_switch.zip`	281034758	281034758

We checked all 35, not just these 5: 35 match, 0 differ, 0 missing.

3. Extraction method. Archives were unpacked as unzip X.zip -d X/ (the zips contain NG/... and OK/... at their root, so the class directory has to be supplied). Original download used aria2 with 4 connections; re-fetching via hf download yields identical bytes.

Impact

The 201 affected entries break down as:

by file type: 81 images, 60 masks, 60 labelme json
81 images vs 60 masks means 21 samples are left with an orphan _mask.png whose image is gone — loaders that pair image/mask by filename will either crash or silently emit a GT entry pointing at a nonexistent file
by anomaly class: Discoloration 33, Deformation 28, BurnMark 28, Fracture 25, OilStain 14, Scratch 12, ExcessMaterial 10, Abrasion 8, GelatinousContaminant 6, MissingPart 6, Porosity 4, ExposedSurface 4, TwistedWire 4, MetallicContaminant 3, Pit 1, Damage 1, and 14 OK (normal) images

At 0.180% this does not change dataset-level statistics much, and we are simply skipping these entries. We are reporting it mainly so that (a) anyone doing image/mask pairing is aware of the orphan masks, and (b) the archives can be re-packed if convenient.

Environment

Debian, UnZip 6.00 of 20 April 2009, by Info-ZIP
Python 3.12.14, huggingface_hub CLI hf
Filesystem: ext4

Affected archives

Files listed below are present in the archive's central directory but their
compressed data fails to inflate (CRC error), so they cannot be extracted.

archive	missing entries	total entries
`realiadvariety_raw/3pin_aviation_connector.zip`	1	3189
`realiadvariety_raw/D_sub_connector.zip`	5	3158
`realiadvariety_raw/angled_toggle_switch.zip`	2	3244
`realiadvariety_raw/bend_connector.zip`	9	3212
`realiadvariety_raw/button_switch.zip`	8	3250
`realiadvariety_raw/circular_aviation_connector.zip`	1	2974
`realiadvariety_raw/connector.zip`	3	3165
`realiadvariety_raw/connector_housing_female.zip`	6	3248
`realiadvariety_raw/crimp_st_cable_mount_box.zip`	9	3216
`realiadvariety_raw/dc_power_connector.zip`	2	3250
`realiadvariety_raw/ffc_connector_plug.zip`	7	3148
`realiadvariety_raw/hall_effect_sensor.zip`	23	3220
`realiadvariety_raw/humidity_sensor.zip`	2	3217
`realiadvariety_raw/joystick_switch.zip`	1	3220
`realiadvariety_raw/limit_switch.zip`	8	3034
`realiadvariety_raw/multi_function_switch.zip`	22	3250
`realiadvariety_raw/pinboard_connector.zip`	15	3250
`realiadvariety_raw/pitch_connector.zip`	10	3160
`realiadvariety_raw/push_button_switch.zip`	8	3224
`realiadvariety_raw/rotary_position_sensor.zip`	3	3192
`realiadvariety_raw/self_lock_switch.zip`	11	3244
`realiadvariety_raw/silicon_cell_sensor.zip`	16	3250
`realiadvariety_raw/slide_switch.zip`	29	3227

Total: 201 of 111673 entries (0.180%)

Full list of affected entries

realiadvariety_raw/3pin_aviation_connector.zip

NG/Abrasion/S0045/3pin_aviation_connector__0045_NG_Abrasion_C2_20240609164648602.png

realiadvariety_raw/D_sub_connector.zip

NG/Deformation/S0039/D_sub_connector__0039_NG_Deformation_C4_20240616151458933_mask.png
NG/Deformation/S0039/D_sub_connector__0039_NG_Deformation_C5_20240616151458948.json
NG/Deformation/S0039/D_sub_connector__0039_NG_Deformation_C5_20240616151458948.png
NG/GelatinousContaminant/S0034/D_sub_connector__0034_NG_GelatinousContaminant_C4_20240616155719361_mask.png
NG/GelatinousContaminant/S0034/D_sub_connector__0034_NG_GelatinousContaminant_C5_20240616155719392.png

realiadvariety_raw/angled_toggle_switch.zip

NG/Discoloration/S0011/angled_toggle_switch__0011_NG_Discoloration_C4_20240717103143435.json
NG/Discoloration/S0011/angled_toggle_switch__0011_NG_Discoloration_C4_20240717103143435.png

realiadvariety_raw/bend_connector.zip

NG/Discoloration/S0048/bend_connector__0048_NG_Discoloration_C2_20240726103952430.json
NG/Discoloration/S0048/bend_connector__0048_NG_Discoloration_C4_20240726103952522.png
NG/Abrasion/S0027/bend_connector__0027_NG_Abrasion_C3_20240726112121512_mask.png
NG/Abrasion/S0027/bend_connector__0027_NG_Abrasion_C4_20240726112121543.json
NG/Abrasion/S0027/bend_connector__0027_NG_Abrasion_C5_20240726112121573_mask.png
NG/Abrasion/S0027/bend_connector__0027_NG_Abrasion_C1_20240726112124106_mask.png
NG/Abrasion/S0027/bend_connector__0027_NG_Abrasion_C1_20240726112124106.json
NG/Abrasion/S0027/bend_connector__0027_NG_Abrasion_C4_20240726112121543.png
NG/Fracture/S0038/bend_connector__0038_NG_Fracture_C2_20240726105104284.png

realiadvariety_raw/button_switch.zip

NG/Porosity/S0016/button_switch__0016_NG_Porosity_C1_20240625162635354_mask.png
NG/Porosity/S0016/button_switch__0016_NG_Porosity_C4_20240625162632776_mask.png
NG/Porosity/S0016/button_switch__0016_NG_Porosity_C5_20240625162632792.png
NG/ExposedSurface/S0032/button_switch__0032_NG_ExposedSurface_C5_20240625170703015.json
NG/ExposedSurface/S0032/button_switch__0032_NG_ExposedSurface_C3_20240625170702953.json
NG/ExposedSurface/S0032/button_switch__0032_NG_ExposedSurface_C1_20240625170705577_mask.png
NG/ExposedSurface/S0032/button_switch__0032_NG_ExposedSurface_C1_20240625170705577.png
NG/Scratch/S0005/button_switch__0005_NG_Scratch_C4_20240625163812190.png

realiadvariety_raw/circular_aviation_connector.zip

NG/MissingPart/S0021/circular_aviation_connector__0021_NG_MissingPart_C2_20240616173420497.png

realiadvariety_raw/connector.zip

NG/MissingPart/S0050/connector__0050_NG_MissingPart_C4_20240528135038877.json
NG/MissingPart/S0050/connector__0050_NG_MissingPart_C1_20240528135041323.json
NG/MissingPart/S0050/connector__0050_NG_MissingPart_C4_20240528135038877.png

realiadvariety_raw/connector_housing_female.zip

NG/Deformation/S0047/connector_housing_female__0047_NG_Deformation_C2_20240613203318416_mask.png
NG/Deformation/S0012/connector_housing_female__0012_NG_Deformation_C3_20240613202111533.png
NG/Discoloration/S0020/connector_housing_female__0020_NG_Discoloration_C1_20240614092656193.json
NG/Discoloration/S0020/connector_housing_female__0020_NG_Discoloration_C3_20240614092653735_mask.png
NG/Discoloration/S0020/connector_housing_female__0020_NG_Discoloration_C4_20240614092653759.json
NG/Discoloration/S0020/connector_housing_female__0020_NG_Discoloration_C1_20240614092656193.png

realiadvariety_raw/crimp_st_cable_mount_box.zip

NG/Discoloration/S0037/crimp_st_cable_mount_box__0037_NG_Discoloration_C1_20240621093502572.json
NG/Discoloration/S0037/crimp_st_cable_mount_box__0037_NG_Discoloration_C2_20240621093459901_mask.png
NG/Discoloration/S0037/crimp_st_cable_mount_box__0037_NG_Discoloration_C4_20240621093459963_mask.png
NG/Discoloration/S0037/crimp_st_cable_mount_box__0037_NG_Discoloration_C5_20240621093459994.json
NG/Discoloration/S0037/crimp_st_cable_mount_box__0037_NG_Discoloration_C3_20240621093459932.json
NG/Discoloration/S0039/crimp_st_cable_mount_box__0039_NG_Discoloration_C3_20240621093525379_mask.png
NG/Discoloration/S0039/crimp_st_cable_mount_box__0039_NG_Discoloration_C5_20240621093525426.png
NG/Scratch/S0022/crimp_st_cable_mount_box__0022_NG_Scratch_C3_20240621191553329.json
NG/Scratch/S0022/crimp_st_cable_mount_box__0022_NG_Scratch_C2_20240621191553297.png

realiadvariety_raw/dc_power_connector.zip

NG/Abrasion/S0006/dc_power_connector__0006_NG_Abrasion_C3_20240622154517452.png
NG/Pit/S0041/dc_power_connector__0041_NG_Pit_C1_20240622152004781.png

realiadvariety_raw/ffc_connector_plug.zip

NG/Fracture/S0007/ffc_connector_plug__0007_NG_Fracture_C3_20240626100957215_mask.png
NG/Fracture/S0007/ffc_connector_plug__0007_NG_Fracture_C5_20240626100957293.png
NG/MetallicContaminant/S0033/ffc_connector_plug__0033_NG_MetallicContaminant_C5_20240626103139956.json
NG/MetallicContaminant/S0033/ffc_connector_plug__0033_NG_MetallicContaminant_C4_20240626103139909_mask.png
NG/MetallicContaminant/S0033/ffc_connector_plug__0033_NG_MetallicContaminant_C1_20240626103142502.png
NG/Scratch/S0042/ffc_connector_plug__0042_NG_Scratch_C2_20240626100353988.json
NG/Scratch/S0042/ffc_connector_plug__0042_NG_Scratch_C5_20240626100354066.png

realiadvariety_raw/hall_effect_sensor.zip

NG/Deformation/S0019/hall_effect_sensor__0019_NG_Deformation_C3_20240618164220595_mask.png
NG/Deformation/S0019/hall_effect_sensor__0019_NG_Deformation_C1_20240618164223219.png
NG/Fracture/S0036/hall_effect_sensor__0036_NG_Fracture_C5_20240618162603637_mask.png
NG/Fracture/S0036/hall_effect_sensor__0036_NG_Fracture_C5_20240618162603637.json
NG/Fracture/S0036/hall_effect_sensor__0036_NG_Fracture_C2_20240618162603543.png
NG/Fracture/S0036/hall_effect_sensor__0036_NG_Fracture_C1_20240618162606199_mask.png
NG/Fracture/S0036/hall_effect_sensor__0036_NG_Fracture_C4_20240618162603621.json
NG/Fracture/S0036/hall_effect_sensor__0036_NG_Fracture_C5_20240618162603637.png
NG/Fracture/S0036/hall_effect_sensor__0036_NG_Fracture_C2_20240618162603543_mask.png
NG/Fracture/S0036/hall_effect_sensor__0036_NG_Fracture_C1_20240618162606199.json
NG/Fracture/S0036/hall_effect_sensor__0036_NG_Fracture_C1_20240618162606199.png
NG/ExcessMaterial/S0036/hall_effect_sensor__0036_NG_ExcessMaterial_C5_20240618170704224.png
NG/ExcessMaterial/S0036/hall_effect_sensor__0036_NG_ExcessMaterial_C5_20240618170704224.json
NG/ExcessMaterial/S0036/hall_effect_sensor__0036_NG_ExcessMaterial_C2_20240618170704145.json
NG/ExcessMaterial/S0045/hall_effect_sensor__0045_NG_ExcessMaterial_C3_20240618170918879.json
NG/ExcessMaterial/S0045/hall_effect_sensor__0045_NG_ExcessMaterial_C2_20240618170918833.json
NG/ExcessMaterial/S0045/hall_effect_sensor__0045_NG_ExcessMaterial_C4_20240618170918895.json
NG/ExcessMaterial/S0045/hall_effect_sensor__0045_NG_ExcessMaterial_C4_20240618170918895_mask.png
NG/ExcessMaterial/S0045/hall_effect_sensor__0045_NG_ExcessMaterial_C3_20240618170918879_mask.png
NG/ExcessMaterial/S0045/hall_effect_sensor__0045_NG_ExcessMaterial_C1_20240618170921488.json
NG/ExcessMaterial/S0045/hall_effect_sensor__0045_NG_ExcessMaterial_C4_20240618170918895.png
OK/S0013/hall_effect_sensor_0013_OK_C4_20240618152543919.png
OK/S0013/hall_effect_sensor_0013_OK_C1_20240618152546496.png

realiadvariety_raw/humidity_sensor.zip

NG/OilStain/S0042/humidity_sensor__0042_NG_Oil_Stain_C4_20240614144309118.json
NG/OilStain/S0042/humidity_sensor__0042_NG_Oil_Stain_C5_20240614144309154.png

realiadvariety_raw/joystick_switch.zip

NG/Fracture/S0035/joystick_switch__0035_NG_Fracture_C4_20240725095333504.png

realiadvariety_raw/limit_switch.zip

NG/Discoloration/S0040/limit_switch__0040_NG_Discoloration_C1_20240513140210704_mask.png
NG/Discoloration/S0040/limit_switch__0040_NG_Discoloration_C4_20240513140151329_mask.png
NG/Discoloration/S0040/limit_switch__0040_NG_Discoloration_C4_20240513140151329.png
NG/GelatinousContaminant/S0043/limit_switch__0043_NG_GelatinousContaminant_C4_20240517171151127_mask.png
NG/GelatinousContaminant/S0015/limit_switch__0015_NG_GelatinousContaminant_C4_20240517164959575.json
NG/GelatinousContaminant/S0015/limit_switch__0015_NG_GelatinousContaminant_C2_20240517164958953.png
NG/GelatinousContaminant/S0015/limit_switch__0015_NG_GelatinousContaminant_C3_20240517164959264.png
OK/S0016/limit_switch_0016_OK_C2_20240510104427575.png

realiadvariety_raw/multi_function_switch.zip

NG/Deformation/S0010/multi_function_switch__0010_NG_Deformation_C4_20240627160454509.json
NG/Deformation/S0010/multi_function_switch__0010_NG_Deformation_C3_20240627160454493_mask.png
NG/Deformation/S0010/multi_function_switch__0010_NG_Deformation_C2_20240627160454446.png
NG/Deformation/S0010/multi_function_switch__0010_NG_Deformation_C2_20240627160454446_mask.png
NG/Deformation/S0010/multi_function_switch__0010_NG_Deformation_C2_20240627160454446.json
NG/Deformation/S0010/multi_function_switch__0010_NG_Deformation_C5_20240627160454540.png
NG/Deformation/S0010/multi_function_switch__0010_NG_Deformation_C4_20240627160454509_mask.png
NG/Deformation/S0010/multi_function_switch__0010_NG_Deformation_C1_20240627160457118_mask.png
NG/Deformation/S0013/multi_function_switch__0013_NG_Deformation_C5_20240627160533500_mask.png
NG/Deformation/S0013/multi_function_switch__0013_NG_Deformation_C5_20240627160533500.png
NG/Discoloration/S0040/multi_function_switch__0040_NG_Discoloration_C3_20240627151407045.json
NG/Discoloration/S0040/multi_function_switch__0040_NG_Discoloration_C4_20240627151407077.json
NG/Discoloration/S0040/multi_function_switch__0040_NG_Discoloration_C5_20240627151407092.png
NG/Discoloration/S0040/multi_function_switch__0040_NG_Discoloration_C3_20240627151407045_mask.png
NG/Discoloration/S0040/multi_function_switch__0040_NG_Discoloration_C4_20240627151407077_mask.png
NG/Discoloration/S0040/multi_function_switch__0040_NG_Discoloration_C1_20240627151409654.json
NG/Discoloration/S0040/multi_function_switch__0040_NG_Discoloration_C4_20240627151407077.png
NG/Fracture/S0033/multi_function_switch__0033_NG_Fracture_C1_20240627153839938.png
NG/BurnMark/S0038/multi_function_switch__0038_NG_Burn_Mark_C4_20240627145014800_mask.png
NG/BurnMark/S0038/multi_function_switch__0038_NG_Burn_Mark_C2_20240627145014738.json
NG/BurnMark/S0008/multi_function_switch__0008_NG_Burn_Mark_C3_20240627144209711.json
NG/BurnMark/S0008/multi_function_switch__0008_NG_Burn_Mark_C1_20240627144212335.png

realiadvariety_raw/pinboard_connector.zip

NG/Discoloration/S0031/pinboard_connector__0031_NG_Discoloration_C4_20240727135224824_mask.png
NG/Discoloration/S0031/pinboard_connector__0031_NG_Discoloration_C1_20240727135227391_mask.png
NG/Discoloration/S0031/pinboard_connector__0031_NG_Discoloration_C3_20240727135224808.json
NG/Discoloration/S0031/pinboard_connector__0031_NG_Discoloration_C4_20240727135224824.json
NG/Discoloration/S0031/pinboard_connector__0031_NG_Discoloration_C2_20240727135224762.json
NG/Discoloration/S0031/pinboard_connector__0031_NG_Discoloration_C3_20240727135224808_mask.png
NG/Discoloration/S0031/pinboard_connector__0031_NG_Discoloration_C4_20240727135224824.png
NG/BurnMark/S0040/pinboard_connector__0040_NG_Burn_Mark_C1_20240730141215701_mask.png
NG/BurnMark/S0040/pinboard_connector__0040_NG_Burn_Mark_C3_20240730141213250_mask.png
NG/BurnMark/S0040/pinboard_connector__0040_NG_Burn_Mark_C1_20240730141215701.json
NG/BurnMark/S0040/pinboard_connector__0040_NG_Burn_Mark_C5_20240730141213310_mask.png
NG/BurnMark/S0040/pinboard_connector__0040_NG_Burn_Mark_C2_20240730141213214_mask.png
NG/BurnMark/S0040/pinboard_connector__0040_NG_Burn_Mark_C3_20240730141213250.png
NG/MissingPart/S0050/pinboard_connector__0050_NG_MissingPart_C3_20240727134457075.png
NG/MissingPart/S0050/pinboard_connector__0050_NG_MissingPart_C2_20240727134457044.png

realiadvariety_raw/pitch_connector.zip

NG/Porosity/S0007/pitch_connector__0007_NG_Porosity_C2_20240624161308531.png
NG/Damage/S0049/pitch_connector__0049_NG_Damage_C5_20240624165944782.png
NG/OilStain/S0033/pitch_connector__0033_NG_Oil_Stain_C2_20240624160339243.json
NG/OilStain/S0033/pitch_connector__0033_NG_Oil_Stain_C5_20240624160339321_mask.png
NG/OilStain/S0033/pitch_connector__0033_NG_Oil_Stain_C1_20240624160341883_mask.png
NG/OilStain/S0033/pitch_connector__0033_NG_Oil_Stain_C5_20240624160339321.json
NG/OilStain/S0033/pitch_connector__0033_NG_Oil_Stain_C1_20240624160341883.json
NG/OilStain/S0033/pitch_connector__0033_NG_Oil_Stain_C4_20240624160339321.json
NG/OilStain/S0033/pitch_connector__0033_NG_Oil_Stain_C3_20240624160339258.png
OK/S0023/pitch_connector_0023_OK_C5_20240624154731892.png

realiadvariety_raw/push_button_switch.zip

NG/Deformation/S0016/push_button_switch__0016_NG_Deformation_C5_20240615171823782_mask.png
NG/Deformation/S0016/push_button_switch__0016_NG_Deformation_C2_20240615171823686_mask.png
NG/Deformation/S0016/push_button_switch__0016_NG_Deformation_C4_20240615171823752_mask.png
NG/Deformation/S0016/push_button_switch__0016_NG_Deformation_C1_20240615171826181.png
NG/OilStain/S0029/push_button_switch__0029_NG_Oil_Stain_C2_20240615173825745.json
NG/OilStain/S0029/push_button_switch__0029_NG_Oil_Stain_C1_20240615173828227.json
NG/OilStain/S0029/push_button_switch__0029_NG_Oil_Stain_C2_20240615173825745.png
NG/Fracture/S0011/push_button_switch__0011_NG_Fracture_C5_20240620102240445.png

realiadvariety_raw/rotary_position_sensor.zip

NG/OilStain/S0013/rotary_position_sensor__0013_NG_Oil_Stain_C5_20240615111610708_mask.png
NG/OilStain/S0013/rotary_position_sensor__0013_NG_Oil_Stain_C5_20240615111610708.png
OK/S0045/rotary_position_sensor_0045_OK_C4_20240615102500608.png

realiadvariety_raw/self_lock_switch.zip

NG/Fracture/S0001/self_lock_switch__0001_NG_Fracture_C1_20240625100753281.json
NG/Fracture/S0001/self_lock_switch__0001_NG_Fracture_C2_20240625100750641_mask.png
NG/Fracture/S0001/self_lock_switch__0001_NG_Fracture_C5_20240625100750719.png
NG/Scratch/S0040/self_lock_switch__0040_NG_Scratch_C1_20240625100209165_mask.png
NG/Scratch/S0040/self_lock_switch__0040_NG_Scratch_C2_20240625100206509.json
NG/Scratch/S0040/self_lock_switch__0040_NG_Scratch_C3_20240625100206556_mask.png
NG/Scratch/S0040/self_lock_switch__0040_NG_Scratch_C4_20240625100206572_mask.png
NG/Scratch/S0040/self_lock_switch__0040_NG_Scratch_C4_20240625100206572.json
NG/Scratch/S0040/self_lock_switch__0040_NG_Scratch_C1_20240625100209165.json
NG/Scratch/S0040/self_lock_switch__0040_NG_Scratch_C2_20240625100206509.png
OK/S0036/self_lock_switch_0036_OK_C3_20240625092930515.png

realiadvariety_raw/silicon_cell_sensor.zip

NG/Discoloration/S0006/silicon_cell_sensor__0006_NG_Discoloration_C4_20240626164415291.png
NG/TwistedWire/S0048/silicon_cell_sensor__0048_NG_TwistedWire_C2_20240626171323488_mask.png
NG/TwistedWire/S0048/silicon_cell_sensor__0048_NG_TwistedWire_C4_20240626171323535.png
NG/TwistedWire/S0048/silicon_cell_sensor__0048_NG_TwistedWire_C2_20240626171323488.json
NG/TwistedWire/S0048/silicon_cell_sensor__0048_NG_TwistedWire_C2_20240626171323488.png
NG/BurnMark/S0007/silicon_cell_sensor__0007_NG_Burn_Mark_C5_20240626171907517_mask.png
NG/BurnMark/S0007/silicon_cell_sensor__0007_NG_Burn_Mark_C4_20240626171907486.json
NG/BurnMark/S0007/silicon_cell_sensor__0007_NG_Burn_Mark_C4_20240626171907486.png
NG/BurnMark/S0007/silicon_cell_sensor__0007_NG_Burn_Mark_C2_20240626171907408.json
NG/BurnMark/S0007/silicon_cell_sensor__0007_NG_Burn_Mark_C2_20240626171907408_mask.png
NG/BurnMark/S0007/silicon_cell_sensor__0007_NG_Burn_Mark_C2_20240626171907408.png
NG/BurnMark/S0031/silicon_cell_sensor__0031_NG_Burn_Mark_C5_20240626172550750_mask.png
NG/BurnMark/S0031/silicon_cell_sensor__0031_NG_Burn_Mark_C2_20240626172550657.png
OK/S0023/silicon_cell_sensor_0023_OK_C5_20240626160035370.png
OK/S0023/silicon_cell_sensor_0023_OK_C4_20240626160035355.png
OK/S0023/silicon_cell_sensor_0023_OK_C1_20240626160037932.png

realiadvariety_raw/slide_switch.zip

NG/Deformation/S0004/slide_switch__0004_NG_Deformation_C2_20240706144128968.json
NG/Deformation/S0004/slide_switch__0004_NG_Deformation_C4_20240706144129030.png
NG/Deformation/S0030/slide_switch__0030_NG_Deformation_C2_20240706144949037.png
NG/Deformation/S0030/slide_switch__0030_NG_Deformation_C1_20240706144951737.json
NG/Deformation/S0030/slide_switch__0030_NG_Deformation_C5_20240706144949147.json
NG/Deformation/S0030/slide_switch__0030_NG_Deformation_C3_20240706144949084_mask.png
NG/Deformation/S0030/slide_switch__0030_NG_Deformation_C4_20240706144949100.png
NG/Fracture/S0010/slide_switch__0010_NG_Fracture_C3_20240706153057732_mask.png
NG/Fracture/S0010/slide_switch__0010_NG_Fracture_C4_20240706153057749.json
NG/Fracture/S0010/slide_switch__0010_NG_Fracture_C3_20240706153057732.png
NG/Fracture/S0013/slide_switch__0013_NG_Fracture_C5_20240706153145403_mask.png
NG/Fracture/S0013/slide_switch__0013_NG_Fracture_C1_20240706153147555.png
NG/Fracture/S0008/slide_switch__0008_NG_Fracture_C2_20240706153013698.png
NG/Fracture/S0008/slide_switch__0008_NG_Fracture_C2_20240706153013698_mask.png
NG/BurnMark/S0023/slide_switch__0023_NG_Burn_Mark_C3_20240706150415184_mask.png
NG/BurnMark/S0023/slide_switch__0023_NG_Burn_Mark_C3_20240706150415184.json
NG/BurnMark/S0023/slide_switch__0023_NG_Burn_Mark_C1_20240706150417431_mask.png
NG/BurnMark/S0023/slide_switch__0023_NG_Burn_Mark_C3_20240706150415184.png
NG/BurnMark/S0023/slide_switch__0023_NG_Burn_Mark_C4_20240706150415216.json
NG/BurnMark/S0023/slide_switch__0023_NG_Burn_Mark_C2_20240706150415169.png
NG/BurnMark/S0023/slide_switch__0023_NG_Burn_Mark_C4_20240706150415216_mask.png
NG/BurnMark/S0023/slide_switch__0023_NG_Burn_Mark_C1_20240706150417431.json
NG/BurnMark/S0023/slide_switch__0023_NG_Burn_Mark_C2_20240706150415169.json
NG/BurnMark/S0023/slide_switch__0023_NG_Burn_Mark_C5_20240706150415263.png
OK/S0029/slide_switch_0029_OK_C5_20240706143351547.png
OK/S0029/slide_switch_0029_OK_C3_20240706143351500.png
OK/S0010/slide_switch_0010_OK_C3_20240706142850752.png
OK/S0010/slide_switch_0010_OK_C4_20240706142850768.png
OK/S0010/slide_switch_0010_OK_C2_20240706142850706.png

zhangBeiQing

14 days ago

Follow-up: a second, harder-to-detect corruption class

After filing this issue we scanned every extracted PNG for a complete IEND trailer and found 188 more images that extract "successfully" but are truncated. These are worse than the ones above because the file exists on disk with a plausible size, so an existence check passes and the failure only surfaces much later inside a DataLoader as:

OSError: image file is truncated

unzip writes the partially-inflated data before hitting the CRC error, so the entry is present but incomplete.

Breakdown of the 188: 106 under OK/, 82 under NG/, 0 masks. Across 24 classes.

They are disjoint from the 201 entries in the original report, so the total is 389 affected files.

Detection method

A valid PNG ends with the 8 bytes 49 45 4E 44 AE 42 60 82 (IEND + its CRC). Checking only the last 8 bytes is enough and scans ~77k files in seconds:

PNG_TAIL = b'IEND\xaeB`\x82'
def png_ok(p):
    if os.path.getsize(p) < 12: return False
    with open(p, 'rb') as f:
        f.seek(-8, os.SEEK_END)
        return f.read() == PNG_TAIL

`slide_switch` is the worst affected and is effectively unusable

It accounts for 102 of the 188 truncated images, plus 29 entries that do not extract at all. The damage is concentrated in the train (normal-only) split:

view	usable train normals	official count
C1	25	25
C2	21	25
C3	0	25
C4	24	25
C5	2	25

Overall slide_switch: train 72/125 usable (58%), test 1057/1120 usable (94.4%).

Because few-shot anomaly detection methods build a per-(class, view) memory bank of normal images, a view with zero usable train normals makes the whole class unusable for that protocol, even though its test split is 94% fine. We had to drop slide_switch entirely, going from 35 to 34 classes.

Separate issue: 641 anomalous samples have `mask_path: null`

Unrelated to the archive corruption, but worth flagging since it breaks image/mask pairing. In the official Real-IAD_Variety_jsons/*.json, 641 entries (all in test, across 23 classes) have anomaly_class != "OK" but mask_path: null. The images themselves are present and decodable; there is simply no pixel annotation, and no _mask.png exists at the conventional path either.

Cross-tab over the 35 classes we downloaded:

anomaly_class	mask_path	count
OK	null	8,750
NG	present	34,094
NG	null	641
OK	present	0

Loaders that assume anomaly_class != "OK" implies a mask will either crash or silently emit an all-zero GT for a genuinely anomalous image, which systematically depresses pixel-level metrics. We exclude these 641 by default.

Net effect on our pipeline

Filtering all three problems (missing entries, truncated images, unmasked NG samples), the 35 downloaded classes yield 34 usable classes with 4,239 train and 37,180 test samples.

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