*Memos:
expand() can get the 0D or more D view tensor of zero or more expanded elements from the 0D or more D tensor of zero or more elements as shown below:
*Memos:
-
expand()can be used with a tensor but not with torch. - Using a tensor(Required-Type:
tensorofint,float,complexorbool). - The 1st or more arguments with a tensor are
size(Required-Type:int,tupleofint,listofintor size()): *Memos:- Its D must be more than or equal to the tensor's D
- If at least one dimension is
0, an empty tensor is returned. -
size=mustn't be used for the one or more dimensions without a tuple, list orsize(). - You can set
-1not to change the dimension. *-1can be used only for existing demensions.
import torch my_tensor = torch.tensor([7, 4, 2]) my_tensor.expand(size=(0, 3)) my_tensor.expand(0, 3) my_tensor.expand(size=(0, -1)) my_tensor.expand(0, -1) # tensor([], size=(0, 3), dtype=torch.int64) my_tensor.expand(size=(3,)) my_tensor.expand(3) my_tensor.expand(size=(-1,)) my_tensor.expand(-1) my_tensor.expand(size=torch.tensor([5, 8, 1]).size()) # tensor([7, 4, 2]) my_tensor.expand(size=(1, 3)) my_tensor.expand(1, 3) my_tensor.expand(size=(1, -1)) my_tensor.expand(1, -1) my_tensor.expand(size=torch.tensor([[5, 8, 1]]).size()) # tensor([[7, 4, 2]]) my_tensor.expand(size=(2, 3)) my_tensor.expand(2, 3) my_tensor.expand(size=(2, -1)) my_tensor.expand(2, -1) my_tensor.expand(size=torch.tensor([[5, 8, 1], [9, 3, 0]]).size()) # tensor([[7, 4, 2], [7, 4, 2]]) my_tensor.expand(size=(3, 3)) my_tensor.expand(3, 3) my_tensor.expand(size=(3, -1)) my_tensor.expand(3, -1) # tensor([[7, 4, 2], [7, 4, 2], [7, 4, 2]]) my_tensor.expand(size=(4, 3)) my_tensor.expand(4, 3) my_tensor.expand(size=(4, -1)) my_tensor.expand(4, -1) # tensor([[7, 4, 2], [7, 4, 2], [7, 4, 2], [7, 4, 2]]) etc. my_tensor.expand(size=(1, 2, 3)) my_tensor.expand(1, 2, 3) my_tensor.expand(size=(1, 2, -1)) my_tensor.expand(1, 2, -1) # tensor([[[7, 4, 2], [7, 4, 2]]]) my_tensor.expand(size=(1, 0, 3)) my_tensor.expand(1, 0, 3) my_tensor.expand(size=(1, 0, -1)) my_tensor.expand(1, 0, -1) # tensor([], size=(1, 0, 3), dtype=torch.int64) my_tensor = torch.tensor([[7], [4], [2]]) my_tensor.expand(size=(3, 1)) my_tensor.expand(3, 1) my_tensor.expand(size=(3, -1)) my_tensor.expand(3, -1) # tensor([[7], [4], [2]]) my_tensor.expand(size=(3, 4)) my_tensor.expand(3, 4) # tensor([[7, 7, 7, 7], # [4, 4, 4, 4], # [2, 2, 2, 2]]) my_tensor = torch.tensor([[7, 4, 2], [5, 1, 6]]) my_tensor.expand(size=(4, 2, 3)) my_tensor.expand(4, 2, 3) my_tensor.expand(size=(4, 2, -1)) my_tensor.expand(4, 2, -1) my_tensor.expand(size=(4, -1, 3)) my_tensor.expand(4, -1, 3) my_tensor.expand(size=(4, -1, -1)) my_tensor.expand(4, -1, -1) # tensor([[[7, 4, 2], [5, 1, 6]], # [[7, 4, 2], [5, 1, 6]], # [[7, 4, 2], [5, 1, 6]], # [[7, 4, 2], [5, 1, 6]]]) my_tensor = torch.tensor([[7., 4., 2.], [5., 1., 6.]]) my_tensor.expand(size=(4, 2, 3)) # tensor([[[7., 4., 2.], [5., 1., 6.]], # [[7., 4., 2.], [5., 1., 6.]], # [[7., 4., 2.], [5., 1., 6.]], # [[7., 4., 2.], [5., 1., 6.]]]) my_tensor = torch.tensor([[7.+0.j, 4.+0.j, 2.+0.j], [5.+0.j, 1.+0.j, 6.+0.j]]) my_tensor.expand(size=(4, 2, 3)) # tensor([[[7.+0.j, 4.+0.j, 2.+0.j], # [5.+0.j, 1.+0.j, 6.+0.j]], # [[7.+0.j, 4.+0.j, 2.+0.j], # [5.+0.j, 1.+0.j, 6.+0.j]], # [[7.+0.j, 4.+0.j, 2.+0.j], # [5.+0.j, 1.+0.j, 6.+0.j]], # [[7.+0.j, 4.+0.j, 2.+0.j], # [5.+0.j, 1.+0.j, 6.+0.j]]]) my_tensor = torch.tensor([[True, False, True], [False, True, False]]) my_tensor.expand(size=(4, 2, 3)) # tensor([[[True, False, True], [False, True, False]], # [[True, False, True], [False, True, False]], # [[True, False, True], [False, True, False]], # [[True, False, True], [False, True, False]]]) 
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