diff --git a/notebooks/classification/preprocessing_ishwari.ipynb b/notebooks/classification/preprocessing_ishwari.ipynb
index 7d7ed0956b9507e525c4625fd62cb1f40917f46b..38437f75320089099424a9d9fdf8dd32a3a83cdb 100644
--- a/notebooks/classification/preprocessing_ishwari.ipynb
+++ b/notebooks/classification/preprocessing_ishwari.ipynb
@@ -2,7 +2,7 @@
  "cells": [
   {
    "cell_type": "code",
-   "execution_count": 172,
+   "execution_count": 42,
    "metadata": {},
    "outputs": [
     {
@@ -161,7 +161,7 @@
        "4             0             0              40           Cuba  <=50K  "
       ]
      },
-     "execution_count": 172,
+     "execution_count": 42,
      "metadata": {},
      "output_type": "execute_result"
     }
@@ -175,7 +175,7 @@
   },
   {
    "cell_type": "code",
-   "execution_count": 173,
+   "execution_count": 43,
    "metadata": {},
    "outputs": [
     {
@@ -213,7 +213,7 @@
   },
   {
    "cell_type": "code",
-   "execution_count": 174,
+   "execution_count": 44,
    "metadata": {},
    "outputs": [
     {
@@ -245,7 +245,7 @@
   },
   {
    "cell_type": "code",
-   "execution_count": 175,
+   "execution_count": 45,
    "metadata": {},
    "outputs": [
     {
@@ -288,7 +288,7 @@
   },
   {
    "cell_type": "code",
-   "execution_count": 176,
+   "execution_count": 46,
    "metadata": {},
    "outputs": [
     {
@@ -329,7 +329,7 @@
   },
   {
    "cell_type": "code",
-   "execution_count": 177,
+   "execution_count": 47,
    "metadata": {},
    "outputs": [
     {
@@ -347,7 +347,7 @@
   },
   {
    "cell_type": "code",
-   "execution_count": 178,
+   "execution_count": 48,
    "metadata": {},
    "outputs": [
     {
@@ -368,7 +368,7 @@
   },
   {
    "cell_type": "code",
-   "execution_count": 179,
+   "execution_count": 49,
    "metadata": {},
    "outputs": [],
    "source": [
@@ -394,7 +394,7 @@
   },
   {
    "cell_type": "code",
-   "execution_count": 180,
+   "execution_count": 50,
    "metadata": {},
    "outputs": [
     {
@@ -522,7 +522,7 @@
        "Income                0.227687  1.000000  "
       ]
      },
-     "execution_count": 180,
+     "execution_count": 50,
      "metadata": {},
      "output_type": "execute_result"
     }
@@ -557,7 +557,7 @@
   },
   {
    "cell_type": "code",
-   "execution_count": 181,
+   "execution_count": 51,
    "metadata": {},
    "outputs": [
     {
@@ -609,7 +609,7 @@
   },
   {
    "cell_type": "code",
-   "execution_count": 182,
+   "execution_count": 52,
    "metadata": {},
    "outputs": [
     {
@@ -664,7 +664,7 @@
   },
   {
    "cell_type": "code",
-   "execution_count": 183,
+   "execution_count": 53,
    "metadata": {},
    "outputs": [
     {
@@ -732,7 +732,7 @@
   },
   {
    "cell_type": "code",
-   "execution_count": 184,
+   "execution_count": 54,
    "metadata": {},
    "outputs": [],
    "source": [
@@ -748,7 +748,7 @@
   },
   {
    "cell_type": "code",
-   "execution_count": 185,
+   "execution_count": 55,
    "metadata": {},
    "outputs": [],
    "source": [
@@ -764,7 +764,7 @@
   },
   {
    "cell_type": "code",
-   "execution_count": 186,
+   "execution_count": 56,
    "metadata": {},
    "outputs": [],
    "source": [
@@ -773,14 +773,14 @@
   },
   {
    "cell_type": "code",
-   "execution_count": 187,
+   "execution_count": 57,
    "metadata": {},
    "outputs": [
     {
      "name": "stdout",
      "output_type": "stream",
      "text": [
-      "✅ Dropped 7655 duplicate rows.\n"
+      "Dropped 7655 duplicate rows.\n"
      ]
     }
    ],
@@ -789,7 +789,7 @@
     "before = df.shape[0]\n",
     "df.drop_duplicates(inplace=True)\n",
     "after = df.shape[0]\n",
-    "print(f\"✅ Dropped {before - after} duplicate rows.\")"
+    "print(f\"Dropped {before - after} duplicate rows.\")"
    ]
   },
   {
@@ -801,7 +801,7 @@
   },
   {
    "cell_type": "code",
-   "execution_count": 188,
+   "execution_count": 58,
    "metadata": {},
    "outputs": [
     {
@@ -846,7 +846,7 @@
   },
   {
    "cell_type": "code",
-   "execution_count": 189,
+   "execution_count": 59,
    "metadata": {},
    "outputs": [],
    "source": [
@@ -856,7 +856,7 @@
   },
   {
    "cell_type": "code",
-   "execution_count": 190,
+   "execution_count": 60,
    "metadata": {},
    "outputs": [
     {
@@ -896,7 +896,7 @@
   },
   {
    "cell_type": "code",
-   "execution_count": 191,
+   "execution_count": 61,
    "metadata": {},
    "outputs": [
     {
@@ -925,7 +925,7 @@
   },
   {
    "cell_type": "code",
-   "execution_count": 192,
+   "execution_count": 62,
    "metadata": {},
    "outputs": [
     {
@@ -987,7 +987,7 @@
   },
   {
    "cell_type": "code",
-   "execution_count": 193,
+   "execution_count": 63,
    "metadata": {},
    "outputs": [],
    "source": [
@@ -1006,7 +1006,7 @@
   },
   {
    "cell_type": "code",
-   "execution_count": 194,
+   "execution_count": 64,
    "metadata": {},
    "outputs": [],
    "source": [
@@ -1035,7 +1035,7 @@
   },
   {
    "cell_type": "code",
-   "execution_count": 195,
+   "execution_count": 65,
    "metadata": {},
    "outputs": [],
    "source": [
@@ -1062,7 +1062,7 @@
   },
   {
    "cell_type": "code",
-   "execution_count": 196,
+   "execution_count": 66,
    "metadata": {},
    "outputs": [],
    "source": [
@@ -1081,7 +1081,7 @@
   },
   {
    "cell_type": "code",
-   "execution_count": 197,
+   "execution_count": 67,
    "metadata": {},
    "outputs": [
     {
@@ -1115,7 +1115,7 @@
   },
   {
    "cell_type": "code",
-   "execution_count": 198,
+   "execution_count": 68,
    "metadata": {},
    "outputs": [],
    "source": [
@@ -1139,7 +1139,7 @@
   },
   {
    "cell_type": "code",
-   "execution_count": 199,
+   "execution_count": 69,
    "metadata": {},
    "outputs": [],
    "source": [
@@ -1150,7 +1150,7 @@
   },
   {
    "cell_type": "code",
-   "execution_count": 200,
+   "execution_count": 70,
    "metadata": {},
    "outputs": [],
    "source": [
@@ -1193,7 +1193,7 @@
   },
   {
    "cell_type": "code",
-   "execution_count": 201,
+   "execution_count": 71,
    "metadata": {},
    "outputs": [],
    "source": [
@@ -1204,7 +1204,7 @@
   },
   {
    "cell_type": "code",
-   "execution_count": 202,
+   "execution_count": 72,
    "metadata": {},
    "outputs": [],
    "source": [
@@ -1214,7 +1214,7 @@
   },
   {
    "cell_type": "code",
-   "execution_count": 203,
+   "execution_count": 73,
    "metadata": {},
    "outputs": [],
    "source": [
@@ -1253,7 +1253,7 @@
   },
   {
    "cell_type": "code",
-   "execution_count": 204,
+   "execution_count": 74,
    "metadata": {},
    "outputs": [],
    "source": [
@@ -1286,7 +1286,7 @@
   },
   {
    "cell_type": "code",
-   "execution_count": 205,
+   "execution_count": 75,
    "metadata": {},
    "outputs": [],
    "source": [
@@ -1306,7 +1306,7 @@
   },
   {
    "cell_type": "code",
-   "execution_count": 206,
+   "execution_count": 76,
    "metadata": {},
    "outputs": [
     {
@@ -1372,7 +1372,7 @@
   },
   {
    "cell_type": "code",
-   "execution_count": 207,
+   "execution_count": 77,
    "metadata": {},
    "outputs": [],
    "source": [
@@ -1407,7 +1407,7 @@
   },
   {
    "cell_type": "code",
-   "execution_count": 208,
+   "execution_count": 78,
    "metadata": {},
    "outputs": [
     {
@@ -1535,7 +1535,7 @@
        "4              40       0      Prof-specialty  Latin America  "
       ]
      },
-     "execution_count": 208,
+     "execution_count": 78,
      "metadata": {},
      "output_type": "execute_result"
     }
@@ -1564,7 +1564,7 @@
   },
   {
    "cell_type": "code",
-   "execution_count": 209,
+   "execution_count": 79,
    "metadata": {},
    "outputs": [
     {
@@ -1790,7 +1790,7 @@
        "[5 rows x 40 columns]"
       ]
      },
-     "execution_count": 209,
+     "execution_count": 79,
      "metadata": {},
      "output_type": "execute_result"
     }
@@ -1820,7 +1820,7 @@
   },
   {
    "cell_type": "code",
-   "execution_count": 210,
+   "execution_count": 80,
    "metadata": {},
    "outputs": [
     {
@@ -2046,7 +2046,7 @@
        "[5 rows x 40 columns]"
       ]
      },
-     "execution_count": 210,
+     "execution_count": 80,
      "metadata": {},
      "output_type": "execute_result"
     }
@@ -2060,7 +2060,7 @@
   },
   {
    "cell_type": "code",
-   "execution_count": 211,
+   "execution_count": 81,
    "metadata": {},
    "outputs": [],
    "source": [
@@ -2070,7 +2070,7 @@
   },
   {
    "cell_type": "code",
-   "execution_count": 212,
+   "execution_count": 82,
    "metadata": {},
    "outputs": [],
    "source": [