notebooks/07-linear regression.ipynb

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   "source": [
    ":dep darn\n",
    ":dep ndarray\n",
    ":dep ndarray-csv\n",
    ":dep polars = { version = \"x\", features = [\"csv\",\"describe\",\"fmt\",\"lazy\",\"ndarray\",\"dtype-categorical\",\"to_dummies\"]}\n",
    ":dep plotters = {version = \"0.3.5\", features = [\"evcxr\", \"line_series\"]}\n",
    ":dep linfa\n",
    ":dep linfa-linear\n",
    "    \n",
    "extern crate csv;\n",
    "\n",
    "use std::io::prelude::*;\n",
    "use std::fs::*;\n",
    "use std::path::Path\n",
    "use ndarray::prelude::*;\n",
    "use ndarray_csv::Array2Reader;\n",
    "use ndarray::*;\n",
    "\n",
    "use polars::prelude::*;\n",
    "use std::fs::File;\n",
    "\n",
    "use linfa::*;\n",
    "use linfa::prelude::*;\n",
    "\n",
    "use linfa::traits::{Fit, Predict};\n",
    "use linfa_linear::LinearRegression;\n",
    "use linfa::prelude::SingleTargetRegression;\n",
    "\n",
    "extern crate plotters;\n",
    "use plotters::prelude::*;\n",
    "use plotters::series::*;\n"
   ]
  },
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   "execution_count": 73,
   "id": "f509a414-605b-468a-9565-ac4c18674b56",
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     "text": [
      "x [[18.0],\n",
      " [23.0],\n",
      " [28.0],\n",
      " [33.0],\n",
      " [38.0],\n",
      " [43.0],\n",
      " [48.0],\n",
      " [53.0],\n",
      " [58.0],\n",
      " [63.0]], shape=[10, 1], strides=[1, 1], layout=CFcf (0xf), const ndim=2\n",
      "y [871.0, 1132.0, 1242.0, 1356.0, 1488.0, 1638.0, 2130.0, 2454.0, 3066.0, 4090.0]\n",
      "intercept:  -558.9494\n",
      "parameters: [61.867886]\n",
      "predict: [554.67255, 864.012, 1173.3513, 1482.6909, 1792.0303, 2101.3696, 2410.709, 2720.0486, 3029.388, 3338.7273]\n"
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       "Scatter regression\n",
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     },
     "execution_count": 73,
     "metadata": {},
     "output_type": "execute_result"
    }
   ],
   "source": [
    "// import database\n",
    "let df = CsvReader::from_path(\"./db/plano.csv\").unwrap()\n",
    "    .has_header(true)\n",
    "    .finish().unwrap();\n",
    "\n",
    "let df= df.clone().lazy();\n",
    "\n",
    "\n",
    "let x = df.clone()\n",
    "    .select([col(\"idade\").cast(DataType::Float32)])\n",
    "    .collect();\n",
    "\n",
    "let y = df.clone().select([col(\"valor\").cast(DataType::Float32)]).collect();\n",
    "\n",
    "\n",
    "let y = y?.column(\"valor\")?.clone();\n",
    "let ndarray_x = x?.clone().to_ndarray::<Float32Type>(IndexOrder::C).unwrap();\n",
    "            println!(\"x {:?}\",ndarray_x);\n",
    "\n",
    "// let ndarray_y =   y?.clone().to_ndarray::<Float32Type>(IndexOrder::C).unwrap();\n",
    "let ndarray_y:Vec<f32> = y.f32()?.into_iter().filter_map(|opt_str| opt_str).collect();\n",
    "        println!(\"y {:?}\",ndarray_y);\n",
    "let mut predict_values:Vec<f32> = vec![];\n",
    "{\n",
    "\n",
    "\n",
    "\n",
    "\n",
    "let ds = Dataset::new(ndarray_x.clone(), ndarray_y.clone().into());\n",
    "let lin_reg = LinearRegression::new();\n",
    "let model = lin_reg.fit(&ds)?;\n",
    "let predict_Values = model.predict(ds);\n",
    "    println!(\"intercept:  {}\", model.intercept());\n",
    "    println!(\"parameters: {}\", model.params());\n",
    "    println!(\"predict: {}\",predict_Values.targets);\n",
    "\n",
    "    predict_values = predict_Values.targets.to_vec();\n",
    "\n",
    "\n",
    "}\n",
    "    \n",
    " let figure = evcxr_figure((900, 640), |root| {\n",
    "    \n",
    " let mut chart = ChartBuilder::on(&root)\n",
    "        .x_label_area_size(35)\n",
    "        .y_label_area_size(40)\n",
    "        .margin(5)\n",
    "        .caption(\"Scatter regression\", (\"sans-serif\", 10.0))\n",
    "        .build_cartesian_2d(0u32..90u32, 0u32..4000u32)?;  \n",
    "    \n",
    "         chart.configure_mesh()\n",
    "                .x_label_formatter(&|x| format!(\"{}\", *x))\n",
    "                .y_label_formatter(&|y| format!(\"{}\", *y))\n",
    "                .draw()?;\n",
    "        \n",
    "        \n",
    "         chart.draw_series(\n",
    "              ndarray_x\n",
    "                 .clone()\n",
    "                .rows()\n",
    "                .into_iter()\n",
    "                .enumerate()\n",
    "                .map(|(index, point)| {   \n",
    "                                let x = point.clone();\n",
    "                                let y = ndarray_y[index].clone() as u32;\n",
    "                                let mut color = &BLUE;\n",
    "\n",
    "                                Circle::new((x[0] as u32, y), 5, color)\n",
    "\n",
    "\n",
    "\n",
    "                            }\n",
    "                 ));\n",
    "\n",
    "             chart.draw_series(\n",
    "              ndarray_x\n",
    "                 .clone()\n",
    "                .rows()\n",
    "                .into_iter()\n",
    "                .enumerate()\n",
    "                .map(|(index, point)| {   \n",
    "                                let x = predict_values[index].clone() as u32;\n",
    "\n",
    "                                let y =  ndarray_x.clone()[[index,0]]  as u32;\n",
    "                                let mut color = &RED;\n",
    "\n",
    "                                Circle::new((y, x), 5, color)\n",
    "\n",
    "\n",
    "\n",
    "                            }\n",
    "                 ));\n",
    "        \n",
    "                   chart.draw_series(LineSeries::new(\n",
    "                        ndarray_x\n",
    "                         .clone()\n",
    "                        .rows()\n",
    "                        .into_iter()\n",
    "                        .enumerate()\n",
    "                        .map(|(index, point)| {   \n",
    "                                 let x = predict_values[index].clone() as u32;\n",
    "\n",
    "                                let y =  ndarray_x.clone()[[index,0]]  as u32;\n",
    "                                let mut color = &RED;\n",
    "\n",
    "                                (y, x)\n",
    "        \n",
    "        \n",
    "        \n",
    "                                    }\n",
    "                         ),\n",
    "                        &RED,\n",
    "                    ))?;\n",
    "\n",
    "    \n",
    "     \n",
    "            Ok(())\n",
    "        }).style(\"width:100%\");\n",
    "\n",
    "figure\n",
    "\n",
    "\n",
    "     "
   ]
  },
  {
   "cell_type": "code",
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   "id": "931e824d-7303-4f9e-95d3-6c0867839461",
   "metadata": {},
   "outputs": [],
   "source": []
  }
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