updated broken url

Summary:
Updated broken link to quantization-aware training section

Pull Request resolved: https://github.com/facebookresearch/d2go/pull/14

Reviewed By: newstzpz

Differential Revision: D26876105

Pulled By: zhanghang1989

fbshipit-source-id: b00bd08da2c8c8e478026ac154a2ca83fd4b19c9

demo/d2go_beginner.ipynb

@@ -435,7 +435,7 @@
     "    cfg.MODEL.WEIGHTS = model_zoo.get_checkpoint_url(\"faster_rcnn_fbnetv3a_C4.yaml\")  # Let training initialize from model zoo\n",
     "    cfg.SOLVER.IMS_PER_BATCH = 2\n",
     "    cfg.SOLVER.BASE_LR = 0.00025  # pick a good LR\n",
-    "    cfg.SOLVER.MAX_ITER = 600    # 300 iterations seems good enough for this toy dataset; you will need to train longer for a practical dataset\n",
+    "    cfg.SOLVER.MAX_ITER = 600    # 600 iterations seems good enough for this toy dataset; you will need to train longer for a practical dataset\n",
     "    cfg.SOLVER.STEPS = []        # do not decay learning rate\n",
     "    cfg.MODEL.ROI_HEADS.BATCH_SIZE_PER_IMAGE = 128   # faster, and good enough for this toy dataset (default: 512)\n",
     "    cfg.MODEL.ROI_HEADS.NUM_CLASSES = 1  # only has one class (ballon). (see https://detectron2.readthedocs.io/tutorials/datasets.html#update-the-config-for-new-datasets)\n",
@@ -517,7 +517,7 @@
    "metadata": {},
    "source": [
     "## Export to Int8 Model\n",
-    "This section export int8 models using post-training quantization. For quantization-aware training, please see the [instructions](https://github.com/facebookresearch/d2go/tree/demo_patch/demo)."
+    "This section export int8 models using post-training quantization. For quantization-aware training, please see the [instructions](https://github.com/facebookresearch/d2go/tree/master/demo#quantization-aware-training)."
    ]
   },
   {
@@ -709,4 +709,4 @@
  },
  "nbformat": 4,
  "nbformat_minor": 4
-}
+}
\ No newline at end of file