WEMLHW2.ipynb

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        "<a href=\"https://colab.research.google.com/github/AkankshaNarula/ML/blob/main/WEMLHW2.ipynb\" target=\"_parent\"><img src=\"https://colab.research.google.com/assets/colab-badge.svg\" alt=\"Open In Colab\"/></a>"
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      "metadata": {
        "id": "NF8YWeZidGp6"
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      "source": [
        "import numpy as np\n",
        "import pandas as pd\n",
        "from sklearn.datasets import load_iris\n",
        "from sklearn.tree import DecisionTreeClassifier, export_graphviz\n",
        "import graphviz"
      ]
    },
    {
      "cell_type": "markdown",
      "source": [
        "Load the Iris dataset."
      ],
      "metadata": {
        "id": "B2mpQd9odLp9"
      }
    },
    {
      "cell_type": "code",
      "source": [
        "iris = load_iris()\n",
        "X = iris.data\n",
        "y = iris.target"
      ],
      "metadata": {
        "id": "B1-MRz3IdWdw"
      },
      "execution_count": null,
      "outputs": []
    },
    {
      "cell_type": "markdown",
      "source": [
        "Split the dataset into training and testing sets."
      ],
      "metadata": {
        "id": "3aQ2AKBbddt8"
      }
    },
    {
      "cell_type": "code",
      "source": [
        "from sklearn.model_selection import train_test_split\n",
        "X_train, X_test, y_train, y_test = train_test_split(X, y, test_size=0.2, random_state=42)\n",
        "from sklearn.model_selection import train_test_split\n",
        "X_train, X_test, y_train, y_test = train_test_split(X, y, test_size=0.2, random_state=42)\n",
        "from sklearn.model_selection import train_test_split\n",
        "X_train, X_test, y_train, y_test = train_test_split(X, y, test_size=0.2, random_state=42)"
      ],
      "metadata": {
        "id": "lszVu12Xdeki"
      },
      "execution_count": null,
      "outputs": []
    },
    {
      "cell_type": "markdown",
      "source": [
        "Implementing and training decision tree classifier\n"
      ],
      "metadata": {
        "id": "t-tfLrS0dul0"
      }
    },
    {
      "cell_type": "code",
      "source": [
        "clf = DecisionTreeClassifier()\n",
        "clf.fit(X_train, y_train)"
      ],
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          "base_uri": "https://localhost:8080/",
          "height": 74
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              "DecisionTreeClassifier()"
            ],
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        "Visualizing decision tree classifier using graphviz"
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        "dot_data = export_graphviz(clf, out_file=None,\n",
        "                           feature_names=iris.feature_names,\n",
        "                           class_names=iris.target_names,\n",
        "                           filled=True, rounded=True,\n",
        "                           special_characters=True)\n",
        "\n",
        "graph = graphviz.Source(dot_data)\n",
        "graph"
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360.52,-443.67 360.23,-435.02\"/>\n<polygon fill=\"black\" stroke=\"black\" points=\"363.73,-434.9 359.89,-425.02 356.73,-435.13 363.73,-434.9\"/>\n</g>\n<!-- 14 -->\n<g id=\"node15\" class=\"node\">\n<title>14</title>\n<path fill=\"#853fe6\" stroke=\"black\" d=\"M603,-425C603,-425 468,-425 468,-425 462,-425 456,-419 456,-413 456,-413 456,-354 456,-354 456,-348 462,-342 468,-342 468,-342 603,-342 603,-342 609,-342 615,-348 615,-354 615,-354 615,-413 615,-413 615,-419 609,-425 603,-425\"/>\n<text text-anchor=\"start\" x=\"464\" y=\"-409.8\" font-family=\"Helvetica,sans-Serif\" font-size=\"14.00\">petal length (cm) ≤ 4.85</text>\n<text text-anchor=\"start\" x=\"500\" y=\"-394.8\" font-family=\"Helvetica,sans-Serif\" font-size=\"14.00\">gini = 0.056</text>\n<text text-anchor=\"start\" x=\"494.5\" y=\"-379.8\" font-family=\"Helvetica,sans-Serif\" font-size=\"14.00\">samples = 35</text>\n<text text-anchor=\"start\" x=\"485\" y=\"-364.8\" font-family=\"Helvetica,sans-Serif\" font-size=\"14.00\">value = [0, 1, 34]</text>\n<text text-anchor=\"start\" x=\"487\" y=\"-349.8\" font-family=\"Helvetica,sans-Serif\" font-size=\"14.00\">class = virginica</text>\n</g>\n<!-- 6&#45;&gt;14 -->\n<g id=\"edge14\" class=\"edge\">\n<title>6&#45;&gt;14</title>\n<path fill=\"none\" stroke=\"black\" d=\"M422.52,-460.91C436.88,-451.2 452.31,-440.76 467.02,-430.81\"/>\n<polygon fill=\"black\" stroke=\"black\" points=\"469.26,-433.52 475.58,-425.02 465.34,-427.72 469.26,-433.52\"/>\n</g>\n<!-- 8 -->\n<g id=\"node9\" class=\"node\">\n<title>8</title>\n<path fill=\"#39e581\" stroke=\"black\" d=\"M254,-298.5C254,-298.5 157,-298.5 157,-298.5 151,-298.5 145,-292.5 145,-286.5 145,-286.5 145,-242.5 145,-242.5 145,-236.5 151,-230.5 157,-230.5 157,-230.5 254,-230.5 254,-230.5 260,-230.5 266,-236.5 266,-242.5 266,-242.5 266,-286.5 266,-286.5 266,-292.5 260,-298.5 254,-298.5\"/>\n<text text-anchor=\"start\" x=\"177.5\" y=\"-283.3\" font-family=\"Helvetica,sans-Serif\" font-size=\"14.00\">gini = 0.0</text>\n<text text-anchor=\"start\" x=\"168\" y=\"-268.3\" font-family=\"Helvetica,sans-Serif\" font-size=\"14.00\">samples = 2</text>\n<text text-anchor=\"start\" x=\"158.5\" y=\"-253.3\" font-family=\"Helvetica,sans-Serif\" font-size=\"14.00\">value = [0, 2, 0]</text>\n<text text-anchor=\"start\" x=\"153\" y=\"-238.3\" font-family=\"Helvetica,sans-Serif\" font-size=\"14.00\">class = versicolor</text>\n</g>\n<!-- 7&#45;&gt;8 -->\n<g id=\"edge8\" class=\"edge\">\n<title>7&#45;&gt;8</title>\n<path fill=\"none\" stroke=\"black\" d=\"M305.42,-341.91C289.69,-329.88 272.5,-316.73 256.88,-304.79\"/>\n<polygon fill=\"black\" stroke=\"black\" points=\"258.94,-301.96 248.87,-298.67 254.69,-307.52 258.94,-301.96\"/>\n</g>\n<!-- 9 -->\n<g id=\"node10\" class=\"node\">\n<title>9</title>\n<path fill=\"#c09cf2\" stroke=\"black\" d=\"M426.5,-306C426.5,-306 296.5,-306 296.5,-306 290.5,-306 284.5,-300 284.5,-294 284.5,-294 284.5,-235 284.5,-235 284.5,-229 290.5,-223 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360.2,-316.02\"/>\n<polygon fill=\"black\" stroke=\"black\" points=\"363.7,-316.11 360.46,-306.02 356.71,-315.93 363.7,-316.11\"/>\n</g>\n<!-- 10 -->\n<g id=\"node11\" class=\"node\">\n<title>10</title>\n<path fill=\"#8139e5\" stroke=\"black\" d=\"M256,-179.5C256,-179.5 167,-179.5 167,-179.5 161,-179.5 155,-173.5 155,-167.5 155,-167.5 155,-123.5 155,-123.5 155,-117.5 161,-111.5 167,-111.5 167,-111.5 256,-111.5 256,-111.5 262,-111.5 268,-117.5 268,-123.5 268,-123.5 268,-167.5 268,-167.5 268,-173.5 262,-179.5 256,-179.5\"/>\n<text text-anchor=\"start\" x=\"183.5\" y=\"-164.3\" font-family=\"Helvetica,sans-Serif\" font-size=\"14.00\">gini = 0.0</text>\n<text text-anchor=\"start\" x=\"174\" y=\"-149.3\" font-family=\"Helvetica,sans-Serif\" font-size=\"14.00\">samples = 3</text>\n<text text-anchor=\"start\" x=\"164.5\" y=\"-134.3\" font-family=\"Helvetica,sans-Serif\" font-size=\"14.00\">value = [0, 0, 3]</text>\n<text text-anchor=\"start\" x=\"163\" y=\"-119.3\" 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0.444</text>\n<text text-anchor=\"start\" x=\"328\" y=\"-141.8\" font-family=\"Helvetica,sans-Serif\" font-size=\"14.00\">samples = 3</text>\n<text text-anchor=\"start\" x=\"318.5\" y=\"-126.8\" font-family=\"Helvetica,sans-Serif\" font-size=\"14.00\">value = [0, 2, 1]</text>\n<text text-anchor=\"start\" x=\"313\" y=\"-111.8\" font-family=\"Helvetica,sans-Serif\" font-size=\"14.00\">class = versicolor</text>\n</g>\n<!-- 9&#45;&gt;11 -->\n<g id=\"edge11\" class=\"edge\">\n<title>9&#45;&gt;11</title>\n<path fill=\"none\" stroke=\"black\" d=\"M362.89,-222.91C363.17,-214.56 363.48,-205.67 363.77,-197.02\"/>\n<polygon fill=\"black\" stroke=\"black\" points=\"367.27,-197.13 364.11,-187.02 360.27,-196.9 367.27,-197.13\"/>\n</g>\n<!-- 12 -->\n<g id=\"node13\" class=\"node\">\n<title>12</title>\n<path fill=\"#39e581\" stroke=\"black\" d=\"M347,-68C347,-68 250,-68 250,-68 244,-68 238,-62 238,-56 238,-56 238,-12 238,-12 238,-6 244,0 250,0 250,0 347,0 347,0 353,0 359,-6 359,-12 359,-12 359,-56 359,-56 359,-62 353,-68 347,-68\"/>\n<text text-anchor=\"start\" x=\"270.5\" y=\"-52.8\" font-family=\"Helvetica,sans-Serif\" font-size=\"14.00\">gini = 0.0</text>\n<text text-anchor=\"start\" x=\"261\" y=\"-37.8\" font-family=\"Helvetica,sans-Serif\" font-size=\"14.00\">samples = 2</text>\n<text text-anchor=\"start\" x=\"251.5\" y=\"-22.8\" font-family=\"Helvetica,sans-Serif\" font-size=\"14.00\">value = [0, 2, 0]</text>\n<text text-anchor=\"start\" x=\"246\" y=\"-7.8\" font-family=\"Helvetica,sans-Serif\" font-size=\"14.00\">class = versicolor</text>\n</g>\n<!-- 11&#45;&gt;12 -->\n<g id=\"edge12\" class=\"edge\">\n<title>11&#45;&gt;12</title>\n<path fill=\"none\" stroke=\"black\" d=\"M340.55,-103.73C335.19,-94.97 329.52,-85.7 324.14,-76.91\"/>\n<polygon fill=\"black\" stroke=\"black\" points=\"327.08,-75 318.88,-68.3 321.11,-78.66 327.08,-75\"/>\n</g>\n<!-- 13 -->\n<g id=\"node14\" class=\"node\">\n<title>13</title>\n<path fill=\"#8139e5\" stroke=\"black\" d=\"M478,-68C478,-68 389,-68 389,-68 383,-68 377,-62 377,-56 377,-56 377,-12 377,-12 377,-6 383,0 389,0 389,0 478,0 478,0 484,0 490,-6 490,-12 490,-12 490,-56 490,-56 490,-62 484,-68 478,-68\"/>\n<text text-anchor=\"start\" x=\"405.5\" y=\"-52.8\" font-family=\"Helvetica,sans-Serif\" font-size=\"14.00\">gini = 0.0</text>\n<text text-anchor=\"start\" x=\"396\" y=\"-37.8\" font-family=\"Helvetica,sans-Serif\" font-size=\"14.00\">samples = 1</text>\n<text text-anchor=\"start\" x=\"386.5\" y=\"-22.8\" font-family=\"Helvetica,sans-Serif\" font-size=\"14.00\">value = [0, 0, 1]</text>\n<text text-anchor=\"start\" x=\"385\" y=\"-7.8\" font-family=\"Helvetica,sans-Serif\" font-size=\"14.00\">class = virginica</text>\n</g>\n<!-- 11&#45;&gt;13 -->\n<g id=\"edge13\" class=\"edge\">\n<title>11&#45;&gt;13</title>\n<path fill=\"none\" stroke=\"black\" d=\"M390.82,-103.73C396.26,-94.97 402.01,-85.7 407.48,-76.91\"/>\n<polygon fill=\"black\" stroke=\"black\" points=\"410.52,-78.64 412.82,-68.3 404.57,-74.95 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font-size=\"14.00\">class = virginica</text>\n</g>\n<!-- 14&#45;&gt;15 -->\n<g id=\"edge15\" class=\"edge\">\n<title>14&#45;&gt;15</title>\n<path fill=\"none\" stroke=\"black\" d=\"M534.81,-341.91C534.66,-333.56 534.51,-324.67 534.36,-316.02\"/>\n<polygon fill=\"black\" stroke=\"black\" points=\"537.86,-315.96 534.19,-306.02 530.86,-316.08 537.86,-315.96\"/>\n</g>\n<!-- 18 -->\n<g id=\"node19\" class=\"node\">\n<title>18</title>\n<path fill=\"#8139e5\" stroke=\"black\" d=\"M731,-298.5C731,-298.5 638,-298.5 638,-298.5 632,-298.5 626,-292.5 626,-286.5 626,-286.5 626,-242.5 626,-242.5 626,-236.5 632,-230.5 638,-230.5 638,-230.5 731,-230.5 731,-230.5 737,-230.5 743,-236.5 743,-242.5 743,-242.5 743,-286.5 743,-286.5 743,-292.5 737,-298.5 731,-298.5\"/>\n<text text-anchor=\"start\" x=\"656.5\" y=\"-283.3\" font-family=\"Helvetica,sans-Serif\" font-size=\"14.00\">gini = 0.0</text>\n<text text-anchor=\"start\" x=\"643.5\" y=\"-268.3\" font-family=\"Helvetica,sans-Serif\" font-size=\"14.00\">samples = 32</text>\n<text text-anchor=\"start\" x=\"634\" y=\"-253.3\" font-family=\"Helvetica,sans-Serif\" font-size=\"14.00\">value = [0, 0, 32]</text>\n<text text-anchor=\"start\" x=\"636\" y=\"-238.3\" font-family=\"Helvetica,sans-Serif\" font-size=\"14.00\">class = virginica</text>\n</g>\n<!-- 14&#45;&gt;18 -->\n<g id=\"edge18\" class=\"edge\">\n<title>14&#45;&gt;18</title>\n<path fill=\"none\" stroke=\"black\" d=\"M587.19,-341.91C602.37,-329.99 618.95,-316.98 634.04,-305.12\"/>\n<polygon fill=\"black\" stroke=\"black\" points=\"636.56,-307.6 642.26,-298.67 632.24,-302.09 636.56,-307.6\"/>\n</g>\n<!-- 16 -->\n<g id=\"node17\" class=\"node\">\n<title>16</title>\n<path fill=\"#8139e5\" stroke=\"black\" d=\"M575,-179.5C575,-179.5 486,-179.5 486,-179.5 480,-179.5 474,-173.5 474,-167.5 474,-167.5 474,-123.5 474,-123.5 474,-117.5 480,-111.5 486,-111.5 486,-111.5 575,-111.5 575,-111.5 581,-111.5 587,-117.5 587,-123.5 587,-123.5 587,-167.5 587,-167.5 587,-173.5 581,-179.5 575,-179.5\"/>\n<text text-anchor=\"start\" x=\"502.5\" y=\"-164.3\" font-family=\"Helvetica,sans-Serif\" font-size=\"14.00\">gini = 0.0</text>\n<text text-anchor=\"start\" x=\"493\" y=\"-149.3\" font-family=\"Helvetica,sans-Serif\" font-size=\"14.00\">samples = 2</text>\n<text text-anchor=\"start\" x=\"483.5\" y=\"-134.3\" font-family=\"Helvetica,sans-Serif\" font-size=\"14.00\">value = [0, 0, 2]</text>\n<text text-anchor=\"start\" x=\"482\" y=\"-119.3\" font-family=\"Helvetica,sans-Serif\" font-size=\"14.00\">class = virginica</text>\n</g>\n<!-- 15&#45;&gt;16 -->\n<g id=\"edge16\" class=\"edge\">\n<title>15&#45;&gt;16</title>\n<path fill=\"none\" stroke=\"black\" d=\"M532.46,-222.91C532.18,-212.2 531.89,-200.62 531.61,-189.78\"/>\n<polygon fill=\"black\" stroke=\"black\" points=\"535.11,-189.57 531.35,-179.67 528.11,-189.75 535.11,-189.57\"/>\n</g>\n<!-- 17 -->\n<g id=\"node18\" class=\"node\">\n<title>17</title>\n<path fill=\"#39e581\" stroke=\"black\" d=\"M714,-179.5C714,-179.5 617,-179.5 617,-179.5 611,-179.5 605,-173.5 605,-167.5 605,-167.5 605,-123.5 605,-123.5 605,-117.5 611,-111.5 617,-111.5 617,-111.5 714,-111.5 714,-111.5 720,-111.5 726,-117.5 726,-123.5 726,-123.5 726,-167.5 726,-167.5 726,-173.5 720,-179.5 714,-179.5\"/>\n<text text-anchor=\"start\" x=\"637.5\" y=\"-164.3\" font-family=\"Helvetica,sans-Serif\" font-size=\"14.00\">gini = 0.0</text>\n<text text-anchor=\"start\" x=\"628\" y=\"-149.3\" font-family=\"Helvetica,sans-Serif\" font-size=\"14.00\">samples = 1</text>\n<text text-anchor=\"start\" x=\"618.5\" y=\"-134.3\" font-family=\"Helvetica,sans-Serif\" font-size=\"14.00\">value = [0, 1, 0]</text>\n<text text-anchor=\"start\" x=\"613\" y=\"-119.3\" font-family=\"Helvetica,sans-Serif\" font-size=\"14.00\">class = versicolor</text>\n</g>\n<!-- 15&#45;&gt;17 -->\n<g id=\"edge17\" class=\"edge\">\n<title>15&#45;&gt;17</title>\n<path fill=\"none\" stroke=\"black\" d=\"M579.3,-222.91C592.62,-211.1 607.15,-198.22 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            "text/plain": [
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          },
          "metadata": {},
          "execution_count": 29
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    }
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}