Make all samples' imports self-contained

Thus, we make sure each sample can be copy-pasted and used in
a stand-alone manner.

Author: popescu-v

doc/samples/samples.rst

@@ -37,6 +37,8 @@ Samples
 .. autofunction:: get_khiops_version
 .. code-block:: python
 
+    from khiops import core as kh
+
     print(f"Khiops version: {kh.get_khiops_version()}")
 .. autofunction:: build_dictionary_from_data_table
 .. code-block:: python
@@ -1635,6 +1637,9 @@ Samples
 .. code-block:: python
 
     # Set the file paths
+    import os
+    from khiops import core as kh
+
     splice_dir = os.path.join(kh.get_samples_dir(), "SpliceJunction")
     dictionary_file_path = os.path.join(splice_dir, "SpliceJunction.kdic")
     data_table_path = os.path.join(splice_dir, "SpliceJunctionDNA.txt")

doc/samples/samples_sklearn.rst

@@ -369,6 +369,7 @@ Samples
     import os
     import pandas as pd
     import pickle
+    from khiops import core as kh
     from khiops.sklearn import KhiopsClassifier
 
     # Create/clean the output directory
@@ -534,7 +535,9 @@ Samples
 .. code-block:: python
 
     # Imports
+    import os
     import pandas as pd
+    from khiops import core as kh
     from khiops.sklearn import KhiopsEncoder
 
     # Load the dataset

khiops/samples/samples.ipynb

@@ -23,6 +23,8 @@
    "metadata": {},
    "outputs": [],
    "source": [
+    "from khiops import core as kh\n",
+    "\n",
     "print(f\"Khiops version: {kh.get_khiops_version()}\")"
    ]
   },
@@ -2167,6 +2169,9 @@
    "outputs": [],
    "source": [
     "# Set the file paths\n",
+    "import os\n",
+    "from khiops import core as kh\n",
+    "\n",
     "splice_dir = os.path.join(kh.get_samples_dir(), \"SpliceJunction\")\n",
     "dictionary_file_path = os.path.join(splice_dir, \"SpliceJunction.kdic\")\n",
     "data_table_path = os.path.join(splice_dir, \"SpliceJunctionDNA.txt\")\n",

khiops/samples/samples.py

@@ -25,6 +25,8 @@
 
 def get_khiops_version():
     """Shows the Khiops version"""
+    from khiops import core as kh
+
     print(f"Khiops version: {kh.get_khiops_version()}")
 
 
@@ -1847,6 +1849,9 @@ def simplify_coclustering():
 def extract_clusters():
     """Extract the clusters' id, members, frequencies and typicalities into a file"""
     # Set the file paths
+    import os
+    from khiops import core as kh
+
     splice_dir = os.path.join(kh.get_samples_dir(), "SpliceJunction")
     dictionary_file_path = os.path.join(splice_dir, "SpliceJunction.kdic")
     data_table_path = os.path.join(splice_dir, "SpliceJunctionDNA.txt")

khiops/samples/samples_sklearn.ipynb

@@ -433,6 +433,7 @@
     "import os\n",
     "import pandas as pd\n",
     "import pickle\n",
+    "from khiops import core as kh\n",
     "from khiops.sklearn import KhiopsClassifier\n",
     "\n",
     "# Create/clean the output directory\n",
@@ -637,7 +638,9 @@
    "outputs": [],
    "source": [
     "# Imports\n",
+    "import os\n",
     "import pandas as pd\n",
+    "from khiops import core as kh\n",
     "from khiops.sklearn import KhiopsEncoder\n",
     "\n",
     "# Load the dataset\n",

khiops/samples/samples_sklearn.py

@@ -374,6 +374,7 @@ def khiops_classifier_pickle():
     import os
     import pandas as pd
     import pickle
+    from khiops import core as kh
     from khiops.sklearn import KhiopsClassifier
 
     # Create/clean the output directory
@@ -555,7 +556,9 @@ def khiops_encoder():
         usually splits the dataset into train and test subsets.
     """
     # Imports
+    import os
     import pandas as pd
+    from khiops import core as kh
     from khiops.sklearn import KhiopsEncoder
 
     # Load the dataset