Fix Datumaro visualizer's import errors after introducing lazy import

[vinnamkim]

Summary

• Ticket no. 127143

How to test

This Python code raises ImportError before this patch.

code

import numpy as np
import datumaro as dm

### Create example dataset ###


def create_example_dataset() -> dm.Dataset:
    blank_img = dm.Image.from_numpy(np.zeros([10, 10, 3], dtype=np.uint8))
    categories = ["label_1", "label_2", "label_3"]

    points_of_1x1_box = np.array([0, 0, 0, 1, 1, 1, 1, 0])

    item_not_to_drop = dm.DatasetItem(
        id="item_not_to_drop",
        media=blank_img,
        annotations=[
            dm.Polygon(
                points=label + points_of_1x1_box,
                label=label,
            )
            for label in range(len(categories))
        ],
    )

    item_drop_by_big_polygon = dm.DatasetItem(
        id="item_drop_by_big_polygon",
        media=blank_img,
        annotations=[
            dm.Polygon(
                points=8 * points_of_1x1_box,  # 8x8 box
                label=0,
            )
        ],
    )

    item_drop_by_polygon_union = dm.DatasetItem(
        id="item_drop_by_polygon_union",
        media=blank_img,
        annotations=[
            dm.Polygon(
                points=offset + 4 * points_of_1x1_box,  # 10 5x5 boxes placed in diagnoal
                label=1,
            )
            for offset in range(10)
        ],
    )

    return dm.Dataset.from_iterable(
        iterable=[
            item_not_to_drop,
            item_drop_by_big_polygon,
            item_drop_by_polygon_union,
        ],
        categories=categories,
    )


dataset = create_example_dataset()
vis = dm.Visualizer(dataset)
fig = vis.vis_gallery([item for item in dataset])
fig.show()

After this patch, there is no more these errors.

Checklist

• I have added unit tests to cover my changes.​
• I have added integration tests to cover my changes.​
• I have added the description of my changes into CHANGELOG.​
• I have updated the documentation accordingly

License

• I submit my code changes under the same MIT License that covers the project.
  Feel free to contact the maintainers if that's a concern.
• I have updated the license header for each file (see an example below).

# Copyright (C) 2023 Intel Corporation
#
# SPDX-License-Identifier: MIT

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Comparison is base (9b254ce) 80.10% compared to head (12b1803) 80.44%.

Additional details and impacted files

@@             Coverage Diff             @@
##           develop    #1220      +/-   ##
===========================================
+ Coverage    80.10%   80.44%   +0.34%     
===========================================
  Files          269      269              
  Lines        29915    29913       -2     
  Branches      5850     5850              
===========================================
+ Hits         23962    24064     +102     
+ Misses        4617     4487     -130     
- Partials      1336     1362      +26     

Flag	Coverage Δ
macos-11_Python-3.8	79.10% <100.00%> (+0.34%)	⬆️
ubuntu-20.04_Python-3.8	80.44% <100.00%> (+0.34%)	⬆️
windows-2022_Python-3.8	80.41% <100.00%> (+0.34%)	⬆️

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[wonjuleee]

Could you implement an optional showing of id and subset info in the visualizer too?

[wonjuleee]

LGTM