Bug with 2D pyramid generator from single image

[liuji1031]

Description

A TypeError is encountered when generating a 2D image pyramid from a single image.

Console output

python produce_error.py
Traceback (most recent call last):
  File "/home/ji-liu/Axle/image-tools/formats/pyramid-generator-2d-tool/produce_error.py", line 20, in <module>
    pg.generate_from_single_image(
  File "/home/ji-liu/Axle/image-tools/formats/pyramid-generator-2d-tool/venv/lib/python3.9/site-packages/argolid/pyramid_generator.py", line 43, in generate_from_single_image
    for c, ds in ds_dict:
TypeError: cannot unpack non-iterable int object

Files

The error stems from here. It should probably be "ds_dict.items()".

To Reproduce

The following code snippet reproduces the error.

import requests
from pathlib import Path
from argolid import PyramidGenerartor

path = Path("./data")
path.mkdir(exist_ok=True)
URL = "https://github.com/usnistgov/WIPP/raw/master/data/PyramidBuilding/inputCollection/"
filename = "img_r001_c001.ome.tif"
if not (path / filename).exists():
    content = requests.get(URL + filename, timeout=10.0).content
    (path / filename).open("wb").write(content)

inp_dir = str(path / filename)
out_dir = str(path)
min_dim = 256
out_format = "NG_Zarr"
ds_dict = {0: "mean"}
pg = PyramidGenerartor()
pg.generate_from_single_image(
        input_file=inp_dir,
        output_dir=out_dir,
        min_dim=min_dim,
        vis_type=out_format,
        ds_dict=ds_dict,
    )