chore: import upstream snapshot with attribution

easygraph/nn/__init__.py

@@ -0,0 +1,23 @@
+try:
+    from .convs.common import MLP
+    from .convs.common import MultiHeadWrapper
+    from .convs.hypergraphs import HGNNConv
+    from .convs.hypergraphs import HGNNPConv
+    from .convs.hypergraphs import HNHNConv
+    from .convs.hypergraphs import HWNNConv
+    from .convs.hypergraphs import HyperGCNConv
+    from .convs.hypergraphs import JHConv
+    from .convs.hypergraphs import UniGATConv
+    from .convs.hypergraphs import UniGCNConv
+    from .convs.hypergraphs import UniGINConv
+    from .convs.hypergraphs import UniSAGEConv
+    from .convs.hypergraphs.halfnlh_conv import HalfNLHconv
+    from .convs.pma import PMA
+    from .loss import BPRLoss
+    from .regularization import EmbeddingRegularization
+except:
+    print(
+        "Warning raise in module:nn. Please install Pytorch, torch_geometric,"
+        " torch_scatter before you use functions related to AllDeepSet and"
+        " AllSetTransformer."
+    )