Limitations of px.imshow

[feiler98]

Dear plotly developers,

I wanted to know if there is a limit for the size of a heatmap generated with px.imshow()
I am currently using it for creating large heatmaps of 1,000+ rows and 10,000+ columns (with custom hovertemplate), but at a certain size saving it as plotly.offline.plot() as html file, the whole document is blank.

Is this a limitation of the plotting method and/or is there a setting that could be changed to increase the heatmap size and complexity (e.g. more information integrated into the hovertemplate)

I am looking forward to your reply!

[camdecoster]

Would you be able to create an example to reproduce the issue that you're seeing? It sounds like a bug, but we'll be able to weigh in with a better answer after seeing the issue.

[feiler98]

@camdecoster thanks for your help!
I will create a reduced example with just the main plot displaying randomly generated numpy ndarray and hoverlabels. The actual html file generated is rather large with 200 to 400 MB and contains several plots which are connected by their axis.
The other plots are summaries of the main plot and do not change in size, hence I currently suspect that there is some issue with the size increase of the main plot.
I will let you know when the plot slice is ready.

Thanks again!

[feiler98]

@camdecoster here is a notebook with a reproducible slice of the plot function.
As suspected, too many heatmap tiles cause a blank html file

https://github.com/feiler98/test_plotly_heatmap/blob/main/test_heatmap.ipynb

It would be great if this limitation could be overcome, plotly is a fantastic tool for data exploration and could be very valuable in the field of genetics.