Update bayesian_network.ipynb

Author: luwill

charpter21_Bayesian_models/bayesian_network.ipynb

@@ -124,7 +124,7 @@
     "from pgmpy.inference import VariableElimination\n",
     "# 贝叶斯网络推断\n",
     "letter_infer = VariableElimination(letter_model)\n",
-    "# 天赋较好且考试不难的情况下推断该学生获得推荐信质量的好坏\n",
+    "# 天赋较好且考试不难的情况下推断该学生获得成绩等级\n",
     "prob_G = letter_infer.query(\n",
     "            variables=['G'],\n",
     "            evidence={'I': 1, 'D': 0})\n",