Describe the bug
get_bx wont work with dict without 'label' key

To Reproduce
Steps to reproduce the behavior:

# passing dict
get_bx({'x_min': 130, 'y_min': 63, 'x_max': 225, 'y_max': 180})

Expected behavior
Returns a Bx with 'unknown' or empty label.

Is your feature request related to a problem? Please describe.
Rather than creating a bunch of anchor boxes based on geometry, create region proposals based on classic signal processing.

In the step: Ask VisBx to use random logits with logits=True

vis.VisBx(image_sz=image_sz, logits=True, feature_sz=feature_sz).show(anchors, labels)

Returns a key error: KeyError: ((1, 1, 3), '<i8') and TypeError: Cannot handle this data type: (1, 1, 3), <i8 with PIL.

Describe the bug
draw() looks for key 'label'

To Reproduce
pass annotations Dict without the key for 'label'

Describe the bug
draw method of vis module tries to iterate over BaseBx during visualisation

To Reproduce
Steps to reproduce the behavior:

anns = {'label': 5,
 'x_min': 87.0,
 'y_min': 196.0,
 'x_max': 1013.0,
 'y_max': 2129.0}

from pybx.ops import make_array
coords, label = make_array(anns)

b = bbx(coords, label)
vis.draw(img, b)

Describe the bug
get_gt_max_iou returns a MultiBx even if single box in it.

To Reproduce
Steps to reproduce the behavior:

passing dict

true_annots = [{'x_min': 130, 'y_min': 63, 'x_max': 225, 'y_max': 180, 'label': 'clock'},
 {'x_min': 13, 'y_min': 158, 'x_max': 90, 'y_max': 213, 'label': 'frame'}]

get_gt_max_iou(
    true_annots,
    coords, 
    positive_boxes=1,  
)

> ({'clock': MultiBx(coords=[[183, 67, 243, 188]], label=['clock']),
  'frame': MultiBx(coords=[12, 152, 72, 256]], label=['frame'])},
{},
{})

Expected behavior
Returns a BaseBx.

Describe the bug

• walkthrough link fails
• Code import os bug

To Reproduce
Steps to reproduce the behavior:

1. Go to '...'
2. Click on '....'
3. Scroll down to '....'
4. See error

Expected behavior
A clear and concise description of what you expected to happen.

Screenshots
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Desktop (please complete the following information):

• OS: [e.g. iOS]
• Browser [e.g. chrome, safari]
• Version [e.g. 22]

Smartphone (please complete the following information):

• Device: [e.g. iPhone6]
• OS: [e.g. iOS8.1]
• Browser [e.g. stock browser, safari]
• Version [e.g. 22]

Additional context
Add any other context about the problem here.

Describe the bug
A clear and concise description of what the bug is.

To Reproduce
Steps to reproduce the behavior:

1. Go to '...'
2. Click on '....'
3. Scroll down to '....'
4. See error

Expected behavior
A clear and concise description of what you expected to happen.

Screenshots
If applicable, add screenshots to help explain your problem.

Desktop (please complete the following information):

• OS: [e.g. iOS]
• Browser [e.g. chrome, safari]
• Version [e.g. 22]

Smartphone (please complete the following information):

• Device: [e.g. iPhone6]
• OS: [e.g. iOS8.1]
• Browser [e.g. stock browser, safari]
• Version [e.g. 22]

Additional context
Add any other context about the problem here.

Would be interesting to add support to OBB