[BUG] jsonschema.exceptions.ValidationError: '{}' is not of type 'array'

[alan20062006]

Describe the bug
When switching from isnet-general-use to sam. Encountered the following bug

` File "/Users/XX/opt/anaconda3/envs/genai/lib/python3.11/site-packages/rembg/bg.py", line 257, in remove
masks = session.predict(img, *args, **kwargs)
^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
File "/Users/XX/opt/anaconda3/envs/genai/lib/python3.11/site-packages/rembg/sessions/sam.py", line 169, in predict
validate(instance=prompt, schema=schema)
File "/Users/XX/opt/anaconda3/envs/genai/lib/python3.11/site-packages/jsonschema/validators.py", line 1312, in validate
raise error
jsonschema.exceptions.ValidationError: '{}' is not of type 'array'

Failed validating 'type' in schema:
{'items': {'properties': {'data': {'items': {'type': 'number'},
'type': 'array'},
'label': {'type': 'integer'},
'type': {'type': 'string'}},
'type': 'object'},
'type': 'array'}

On instance:
'{}'`

To Reproduce
I was using isnet-general-use for a long time and is looking for a better solution so I changed to sam.

Rembg version:
v 2.0.53

Additional context
Add any other context about the problem here.

[loeweh]

I have the same issue. switching to sam raises the bug

[gio-foldai]

Stumbled on this today. This seems to be a bug in sam.py, where

   prompt = kwargs.get("sam_prompt", "{}")  # here "{}" should be []

But the reason this bug went undiscovered is that you're supposed to tell sam what to segment, passing a prompt, for example:

rembg.remove(img, session=REMBG_SESSION, sam_prompt=[{"type": "point", "data": [0, 0], "label": 1}])

[github-actions]

This issue is stale because it has been open for 30 days with no activity.

[github-actions]

This issue was closed because it has been inactive for 14 days since being marked as stale.