v2.1.0 installation (#210)

* [Major] Update README for v2.1.0

* [Minor] Update README.md

* [Minor] Update README.md

* [Minor] Update README.md

* [Minor] Add installation.

---------

Co-authored-by: ys-2020 <shangy@mit.edu>
Co-authored-by: Haotian Tang <haotian@k5.mit.edu>

install.py

@@ -0,0 +1,43 @@
+from typing import List
+import os
+import torch
+
+__version__ = "2.1.0"
+
+
+def find_maximal_match(support_list: List, target):
+    if target in support_list:
+        return target
+    else:
+        max_match_version = None
+        for item in support_list:
+            if item <= target:
+                max_match_version = item
+        if max_match_version == None:
+            max_match_version = support_list[0]
+            print(f"[Warning] CUDA version {target} is too low, may not be well supported by torch_{torch.__version__}.")
+        return max_match_version
+
+torch_cuda_mapping = dict([
+    ('torch19',['11.1']),
+    ('torch110',['11.1','11.3']),
+    ('torch111',['11.3','11.5']),
+    ('torch112',['11.3','11.6']),
+    ('torch113',['11.6','11.7']),
+    ('torch20',['11.7','11.8']),
+])
+
+torch_tag, _ = ('torch' + torch.__version__).rsplit('.', 1)
+torch_tag = torch_tag.replace('.', '')
+
+if torch.cuda.is_available():
+  cuda_version = torch.version.cuda
+  support_cuda_list = torch_cuda_mapping[torch_tag]
+  cuda_version = find_maximal_match(support_cuda_list, cuda_version)
+  cuda_tag = 'cu' + cuda_version
+else:
+  cuda_tag = 'cpu'
+cuda_tag = cuda_tag.replace('.', '')
+
+
+os.system(f"pip install --extra-index-url http://24.199.104.228/simple --trusted-host 24.199.104.228 torchsparse=={__version__}+{torch_tag}{cuda_tag}")