Explorer tiles crash if there is exactly one cluster tile

[martin-ueding]

Reported by @pstorch:

2023-11-26 12:10:38 geo_activity_playground.webui.app ERROR Exception on /explorer/14 [GET]
Traceback (most recent call last):
  File "/home/peter/.cache/pypoetry/virtualenvs/geo-activity-playground-uIcfKzN9-py3.11/lib/python3.11/site-packages/flask/app.py", line 1455, in wsgi_app
    response = self.full_dispatch_request()
               ^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "/home/peter/.cache/pypoetry/virtualenvs/geo-activity-playground-uIcfKzN9-py3.11/lib/python3.11/site-packages/flask/app.py", line 869, in full_dispatch_request
    rv = self.handle_user_exception(e)
         ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "/home/peter/.cache/pypoetry/virtualenvs/geo-activity-playground-uIcfKzN9-py3.11/lib/python3.11/site-packages/flask/app.py", line 867, in full_dispatch_request
    rv = self.dispatch_request()
         ^^^^^^^^^^^^^^^^^^^^^^^
  File "/home/peter/.cache/pypoetry/virtualenvs/geo-activity-playground-uIcfKzN9-py3.11/lib/python3.11/site-packages/flask/app.py", line 852, in dispatch_request
    return self.ensure_sync(self.view_functions[rule.endpoint])(**view_args)
           ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "/home/peter/git/geo-activity-playground/geo_activity_playground/webui/app.py", line 49, in explorer
    "explorer.html.j2", **explorer_controller.render(int(zoom))
                          ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "/home/peter/git/geo-activity-playground/geo_activity_playground/webui/explorer_controller.py", line 26, in render
    explored = get_three_color_tiles(tiles, self._repository, zoom)
               ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "/home/peter/git/geo-activity-playground/geo_activity_playground/explorer/grid_file.py", line 83, in get_three_color_tiles
    labels = dbscan.fit_predict(cluster_tiles)
             ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "/home/peter/.cache/pypoetry/virtualenvs/geo-activity-playground-uIcfKzN9-py3.11/lib/python3.11/site-packages/sklearn/cluster/_dbscan.py", line 454, in fit_predict
    self.fit(X, sample_weight=sample_weight)
  File "/home/peter/.cache/pypoetry/virtualenvs/geo-activity-playground-uIcfKzN9-py3.11/lib/python3.11/site-packages/sklearn/base.py", line 1152, in wrapper
    return fit_method(estimator, *args, **kwargs)
           ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "/home/peter/.cache/pypoetry/virtualenvs/geo-activity-playground-uIcfKzN9-py3.11/lib/python3.11/site-packages/sklearn/cluster/_dbscan.py", line 376, in fit
    X = self._validate_data(X, accept_sparse="csr")
        ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "/home/peter/.cache/pypoetry/virtualenvs/geo-activity-playground-uIcfKzN9-py3.11/lib/python3.11/site-packages/sklearn/base.py", line 605, in _validate_data
    out = check_array(X, input_name="X", **check_params)
          ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "/home/peter/.cache/pypoetry/virtualenvs/geo-activity-playground-uIcfKzN9-py3.11/lib/python3.11/site-packages/sklearn/utils/validation.py", line 938, in check_array
    raise ValueError(
ValueError: Expected 2D array, got 1D array instead:
array=[].
Reshape your data either using array.reshape(-1, 1) if your data has a single feature or array.reshape(1, -1) if it contains a single sample.
2023-11-26 12:10:38 werkzeug INFO 127.0.0.1 - - [26/Nov/2023 12:10:38] "GET /explorer/14 HTTP/1.1" 500 -

[martin-ueding]

It seems that you have no cluster tiles yet. Is that possible?

[pstorch]

"no cluster tiles"? Do I need to install something separately?

[martin-ueding]

I meant that you just don't have explored any tiles which are clustered. I've tried to fix that. Can you do a git pull and try again?

[pstorch]

Explore works now. I see 4 blue and 2 red tiles.