update 3d seg demo (#326)

Signed-off-by: Wenqi Li <[email protected]>

Author: wyli

3d_segmentation/spleen_segmentation_3d_lightning.ipynb

@@ -60,7 +60,7 @@
    "source": [
     "!python -c \"import monai\" || pip install -q \"monai-weekly[nibabel]\"\n",
     "!python -c \"import matplotlib\" || pip install -q matplotlib\n",
-    "!pip install -q pytorch-lightning==0.9.0\n",
+    "!pip install -q pytorch-lightning==1.4.0\n",
     "%matplotlib inline"
    ]
   },
@@ -145,8 +145,6 @@
     "from monai.apps import download_and_extract\n",
     "import torch\n",
     "import pytorch_lightning\n",
-    "from pytorch_lightning.callbacks.model_checkpoint \\\n",
-    "    import ModelCheckpoint\n",
     "import matplotlib.pyplot as plt\n",
     "import tempfile\n",
     "import shutil\n",
@@ -424,17 +422,13 @@
     "tb_logger = pytorch_lightning.loggers.TensorBoardLogger(\n",
     "    save_dir=log_dir\n",
     ")\n",
-    "checkpoint_callback = ModelCheckpoint(\n",
-    "    filepath=os.path.join(\n",
-    "        log_dir, \"{epoch}-{val_loss:.2f}-{val_dice:.2f}\")\n",
-    ")\n",
     "\n",
     "# initialise Lightning's trainer.\n",
     "trainer = pytorch_lightning.Trainer(\n",
     "    gpus=[0],\n",
     "    max_epochs=600,\n",
     "    logger=tb_logger,\n",
-    "    checkpoint_callback=checkpoint_callback,\n",
+    "    checkpoint_callback=True,\n",
     "    num_sanity_val_steps=1,\n",
     ")\n",
     "\n",
@@ -710,7 +704,7 @@
    "name": "python",
    "nbconvert_exporter": "python",
    "pygments_lexer": "ipython3",
-   "version": "3.8.10"
+   "version": "3.7.10"
   }
  },
  "nbformat": 4,