Using holoviews tries to load plotly even if it is not installed

[mb-915]

Describe the bug

When I import holoviews, there is an error, marimo seems to be calling hv.renderer that tries to import plotly even if it is neither installed nor used.

Could not find a 'plotly' renderer, available renderers are: 'bokeh'.'

The error seem to be located here :

marimo/marimo/_output/formatters/holoviews_formatters.py

Lines 61 to 66 in e634a8d

	hv.renderer("bokeh").theme = (
	"dark_minimal" if theme == "dark" else None
	)
	hv.renderer("plotly").theme = (
	"plotly_dark" if theme == "dark" else "plotly"
	)

I wrote a patch that I currently use (it is working for me):
mb-915@5c2e324
but I couldn't get the tests to pass and I’m not sure if adding bokeh in DependencyManager is right. Therefore, I'm not opening a PR for now.

Environment

{
  "marimo": "0.8.7",
  "OS": "Linux",
  "OS Version": "6.9.8-zen1",
  "Processor": "",
  "Python Version": "3.11.8",
  "Binaries": {
    "Browser": "--",
    "Node": "--"
  },
  "Requirements": {
    "click": "8.1.7",
    "importlib-resources": "missing",
    "jedi": "0.19.1",
    "markdown": "3.5.2",
    "pymdown-extensions": "10.7.1",
    "pygments": "2.17.2",
    "tomlkit": "0.13.2",
    "uvicorn": "0.30.6",
    "starlette": "0.38.4",
    "websockets": "12.0",
    "typing-extensions": "4.10.0",
    "ruff": "0.5.7"
  }
}

Code to reproduce

(in an environment without plotly)

import marimo as mo
import holoviews as hv

[mscolnick]

thank you for filing @mb-915! the patch looks correct (not sure why the tests would not pass). do you want to open a PR with that patch or would you like me to? I can look at the test failure reasons, if it does end up failing.

[mb-915]

i opened a PR #2199

The failing tests do not seem to be linked to the modification. There might be something in my dev environment.