Mixed bag clean up (#1425)

yeah handful of things

1) Combined some layer

2) made comments referring to bugs use consistent format 

3) removed low usage packages and tests, we recently launched package
manager. we can confidently remove more unused packages. The following
packages are to be removed:
- pykalman
- preprocessing
- hmmlearn
- gplearn
- geoplot
- polyglot
- ggplot
- descartes
- fitter
- imagecodecs
- wfdb
- hpsklearn
- cleverhans
- osmnx
- pysal
- wordsegment
- vowpalwabbit
- feather
- kmodes
- ortools
- mlens
- vecstack
- Geohash
- geoviews
- s2sphere
- flashtext
- kmapper
- stemming
- hunspell
- spectral
- essentia
- hypertools
- stop_words
- scattertext
- vaex
- blake3
- catalyst (note no longer maintained since 2022)

Author: calderjo

Dockerfile.tmpl

@@ -4,6 +4,5 @@ class TestImport(unittest.TestCase):
     # Basic import tests for packages without any.
     def test_basic(self):
         import bq_helper
-        import cleverhans
         import tensorflow_datasets
         import segment_anything

tests/test_catalyst.py

@@ -1,10 +1,17 @@
 import unittest
 import os.path
 
+from distutils.version import StrictVersion
+
+import matplotlib
 import matplotlib.pyplot as plt
 import numpy as np
 
 class TestMatplotlib(unittest.TestCase):
+    def test_version(self):
+        # b/308525631: newer versions of Matplotlib causes learntools to fail
+        self.assertLess(StrictVersion(matplotlib.__version__), StrictVersion("3.8.0"))
+
     def test_plot(self):
         plt.plot(np.linspace(0,1,50), np.random.rand(50))
         plt.savefig("plot1.png")