refactor variable initialization

Author: fancaiyu

.github/workflows/CI.yml

@@ -3,10 +3,10 @@ name: CI
 on: 
   push:
     branches:
-      - master
+      - test
   pull_request:
     branches:
-      - master
+      - test
 
 permissions:
   contents: write

MCintegration/maps.py

@@ -17,11 +17,11 @@ def __init__(self, batch_size, dim, f_dim, device=None, dtype=torch.float32):
         self.dim = dim
         self.f_dim = f_dim
         self.batch_size = batch_size
-        self.u = torch.empty((batch_size, dim), dtype=dtype, device=self.device)
-        self.x = torch.empty((batch_size, dim), dtype=dtype, device=self.device)
-        self.fx = torch.empty((batch_size, f_dim), dtype=dtype, device=self.device)
-        self.weight = torch.empty((batch_size,), dtype=dtype, device=self.device)
-        self.detJ = torch.empty((batch_size,), dtype=dtype, device=self.device)
+        self.u = torch.rand((batch_size, dim), dtype=dtype, device=self.device)
+        self.x = torch.rand((batch_size, dim), dtype=dtype, device=self.device)
+        self.fx = torch.zeros((batch_size, f_dim), dtype=dtype, device=self.device)
+        self.weight = torch.ones((batch_size,), dtype=dtype, device=self.device)
+        self.detJ = torch.ones((batch_size,), dtype=dtype, device=self.device)
 
 
 class Map(nn.Module):