fossasia/visdom

visdom.images() sometimes draw all black images

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#602 opened on Apr 8, 2019

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 (8 comments) (1 reaction) (0 assignees)Python (9,831 stars) (1,152 forks)batch import
Fix Proposedenhancementhelp wanted

Description

Bug Description I use the mean=[0.485, 0.456, 0.406],std=[0.229, 0.224, 0.225] to normalize the image. Then I do some translates on these images. Finally, I restore these images to the normal state and use the visdom.images() to show the images. The problem is that sometimes these images are all black, I print the image matrix and all values are [0-1],which are right. Strangely,sometimes these images can draw normally.

Screenshots

This is the case: image

Contributor guide

Tech stack
pythonnumpypytorch
Domain
data
Issue type
bug
DifficultyEstimated implementation difficulty for a new contributor, from 1 for very small changes to 5 for expert-level work.
3
Estimated timeA rough time range for an experienced contributor to investigate, implement, test, and prepare a pull request.
half day
Activity statusHow available the issue appears right now: fresh, active, stale, blocked, or waiting on maintainer input.
stale
ClarityHow clearly the issue explains the expected change, acceptance criteria, and next step.
mostly clear
Prerequisites
PythonPyTorch or NumPyvisdom library
Newbie friendlinessA 1-100 score estimating how approachable this issue is for first-time contributors.
40
Research direction
Investigate the visdom.images() function in the visdom source code (likely in visdom/ init .py or similar). The issue occurs sporadically after image normalization and restoration. Check how the function handles image data types and value ranges. Also review the comments in the issue for any additional clues. Consider writing a minimal reproducible script to isolate the problem.