Create README.md

Author: fxia22

README.md

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+# pointnet.pytorch
+This repo is implementation for PointNet in pytorch https://arxiv.org/abs/1612.00593 in pytorch. The model is in file `pointnet.py`.
+
+
+# Download data and running
+
+```
+bash build.sh #build C++ code for visualization
+bash download.sh #download dataset
+python train_classification.py #train 3D model classification
+python python train_segmentation.py # train 3D model segmentaion
+
+python show_seg.py --model seg/seg_model_20.pth  # show segmentation results
+```
+
+# Performance
+Without heavy tuning, PointNet can achieve 80-90% performance in classification and segmentaion on this [dataset](http://web.stanford.edu/~ericyi/project_page/part_annotation/index.html). 
+
+Sample segmentation result:
+![seg](https://raw.githubusercontent.com/fxia22/pointnet.pytorch/master/misc/show3d.png?token=AE638Oy51TL2HDCaeCF273X_-Bsy6-E2ks5Y_BUzwA%3D%3D)
+
+
+#Links
+-[Project Page](http://stanford.edu/~rqi/pointnet/)
+-[Tensorflow implementation](https://github.com/charlesq34/pointnet)