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fix cyfi445 lab 7

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Frank Xu
2025-10-02 09:45:16 -04:00
parent b3a07c5bcc
commit 5f3192c3d1
1 changed files with 7 additions and 1 deletions
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8
CYFI445/lectures/07_binary_classification_n_to_1/0_predict_breast_cancer_A_steps.ipynb
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@@ -217,14 +217,20 @@
}, },
{ {
"cell_type": "code", "cell_type": "code",
"execution_count": 11, "execution_count": null,
"id": "3aeb88da", "id": "3aeb88da",
"metadata": {}, "metadata": {},
"outputs": [], "outputs": [],
"source": [ "source": [
"# Scale features\n", "# Scale features\n",
"scaler = StandardScaler()\n", "scaler = StandardScaler()\n",
"# fit() computes the mean and std of each feature using the training data only.\n",
"# transform() applies the standardization formula to scale the data.\n",
"# fit_transform() does both in one step.\n",
"X_train = scaler.fit_transform(X_train)\n", "X_train = scaler.fit_transform(X_train)\n",
"# Very important: we do not fit again on the test set.\n",
"# Instead, we use the same mean and std from the training set (stored inside scaler) to transform the test data.\n",
"# This prevents data leakage — making sure the test set stays “unseen” during training.\n",
"X_test = scaler.transform(X_test)\n", "X_test = scaler.transform(X_test)\n",
"\n", "\n",
"# Convert to PyTorch tensors\n", "# Convert to PyTorch tensors\n",