*Memos:
- My post explains Flatten().
- My post explains unflatten().
flatten() can remove zero or more dimensions by selecting dimensions from the 0D or more D tensor of zero or more elements, getting the 1D or more D tensor of zero or more elements as shown below:
*Memos:
-
flatten()
can be used with torch or a tensor. - The 1st argument(
input
) withtorch
or using a tensor(Required-Type:tensor
ofint
,float
,complex
orbool
). - The 2nd argument with
torch
or the 1st argument with a tensor isstart_dim
(Optional-Default:0
-Type:int
). - The 3rd argument with
torch
or the 2nd argument with a tensor isend_dim
(Optional-Default:-1
-Type:int
). -
flatten()
can change a 0D tensor to a 1D tensor. -
flatten()
does nothing for a 1D tensor. - The difference between Flatten() and flatten() is:
- The default value of
start_dim
forFlatten()
is1
while the default value ofstart_dim
forflatten()
is0
. - Basically,
Flatten()
is used to define a model whileflatten()
is not used to define a model.
- The default value of
import torch
my_tensor = torch.tensor(7)
torch.flatten(input=my_tensor)
my_tensor.flatten()
torch.flatten(input=my_tensor, start_dim=0, end_dim=0)
torch.flatten(input=my_tensor, start_dim=0, end_dim=-1)
torch.flatten(input=my_tensor, start_dim=-1, end_dim=0)
torch.flatten(input=my_tensor, start_dim=-1, end_dim=-1)
# tensor([7])
my_tensor = torch.tensor([7, 1, -8, 3, -6, 0])
torch.flatten(input=my_tensor)
torch.flatten(input=my_tensor, start_dim=0, end_dim=0)
torch.flatten(input=my_tensor, start_dim=0, end_dim=-1)
torch.flatten(input=my_tensor, start_dim=-1, end_dim=0)
torch.flatten(input=my_tensor, start_dim=-1, end_dim=-1)
# tensor([7, 1, -8, 3, -6, 0])
my_tensor = torch.tensor([[7, 1, -8], [3, -6, 0]])
torch.flatten(input=my_tensor)
torch.flatten(input=my_tensor, start_dim=0, end_dim=1)
torch.flatten(input=my_tensor, start_dim=0, end_dim=-1)
torch.flatten(input=my_tensor, start_dim=-2, end_dim=1)
torch.flatten(input=my_tensor, start_dim=-2, end_dim=-1)
# tensor([7, 1, -8, 3, -6, 0])
torch.flatten(input=my_tensor, start_dim=0, end_dim=0)
torch.flatten(input=my_tensor, start_dim=-1, end_dim=-1)
torch.flatten(input=my_tensor, start_dim=0, end_dim=-2)
torch.flatten(input=my_tensor, start_dim=1, end_dim=1)
torch.flatten(input=my_tensor, start_dim=1, end_dim=-1)
torch.flatten(input=my_tensor, start_dim=-1, end_dim=1)
torch.flatten(input=my_tensor, start_dim=-1, end_dim=-1)
torch.flatten(input=my_tensor, start_dim=-2, end_dim=0)
torch.flatten(input=my_tensor, start_dim=-2, end_dim=-2)
# tensor([[7, 1, -8], [3, -6, 0]])
my_tensor = torch.tensor([[[7], [1], [-8]], [[3], [-6], [0]]])
torch.flatten(input=my_tensor)
torch.flatten(input=my_tensor, start_dim=0, end_dim=2)
torch.flatten(input=my_tensor, start_dim=0, end_dim=-1)
torch.flatten(input=my_tensor, start_dim=-3, end_dim=2)
torch.flatten(input=my_tensor, start_dim=-3, end_dim=-1)
# tensor([7, 1, -8, 3, -6, 0])
torch.flatten(input=my_tensor, start_dim=0, end_dim=0)
torch.flatten(input=my_tensor, start_dim=0, end_dim=-3)
torch.flatten(input=my_tensor, start_dim=1, end_dim=1)
torch.flatten(input=my_tensor, start_dim=1, end_dim=-2)
torch.flatten(input=my_tensor, start_dim=2, end_dim=2)
torch.flatten(input=my_tensor, start_dim=2, end_dim=-1)
torch.flatten(input=my_tensor, start_dim=-1, end_dim=2)
torch.flatten(input=my_tensor, start_dim=-1, end_dim=-1)
torch.flatten(input=my_tensor, start_dim=-2, end_dim=1)
torch.flatten(input=my_tensor, start_dim=-2, end_dim=-2)
torch.flatten(input=my_tensor, start_dim=-3, end_dim=0)
torch.flatten(input=my_tensor, start_dim=-3, end_dim=-3)
# tensor([[[7], [1], [-8]], [[3], [-6], [0]]])
torch.flatten(input=my_tensor, start_dim=0, end_dim=1)
torch.flatten(input=my_tensor, start_dim=0, end_dim=-2)
torch.flatten(input=my_tensor, start_dim=-3, end_dim=1)
torch.flatten(input=my_tensor, start_dim=-3, end_dim=-2)
# tensor([[7], [1], [-8], [3], [-6], [0]])
torch.flatten(input=my_tensor, start_dim=1, end_dim=2)
torch.flatten(input=my_tensor, start_dim=1, end_dim=-1)
torch.flatten(input=my_tensor, start_dim=-2, end_dim=2)
torch.flatten(input=my_tensor, start_dim=-2, end_dim=-1)
# tensor([[7, 1, -8], [3, -6, 0]])
my_tensor = torch.tensor([[[7.], [1.], [-8.]], [[3.], [-6.], [0.]]])
torch.flatten(input=my_tensor)
# tensor([7., 1., -8., 3., -6., 0.])
my_tensor = torch.tensor([[[7.+0.j], [1.+0.j], [-8.+0.j]],
[[3.+0.j], [-6.+0.j], [0.+0.j]]])
torch.flatten(input=my_tensor)
# tensor([7.+0.j, 1.+0.j, -8.+0.j, 3.+0.j, -6.+0.j, 0.+0.j])
my_tensor = torch.tensor([[[True], [False], [True]],
[[False], [True], [False]]])
torch.flatten(input=my_tensor)
# tensor([True, False, True, False, True, False])
ravel() can remove zero or more dimensions as much as possible from the 0D or more D tensor of zero or more elements, getting the 1D tensor of zero or more elements as shown below:
*Memos:
-
ravel()
can be used withtorch
or a tensor. - The 1st argument(
input
) withtorch
or using a tensor(Required-Type:tensor
ofint
,float
,complex
orbool
). -
ravel()
can change a 0D tensor to a 1D tensor. -
ravel()
does nothing for a 1D tensor.
import torch
my_tensor = torch.tensor(7)
torch.ravel(input=my_tensor)
my_tensor.ravel()
# tensor([7])
my_tensor = torch.tensor([7, 1, -8, 3, -6, 0])
torch.ravel(input=my_tensor)
# tensor([7, 1, -8, 3, -6, 0])
my_tensor = torch.tensor([[7, 1, -8], [3, -6, 0]])
torch.ravel(input=my_tensor)
# tensor([7, 1, -8, 3, -6, 0])
my_tensor = torch.tensor([[[7], [1], [-8]], [[3], [-6], [0]]])
torch.ravel(input=my_tensor)
# tensor([7, 1, -8, 3, -6, 0])
my_tensor = torch.tensor([[[7.], [1.], [-8.]], [[3.], [-6.], [0.]]])
torch.ravel(input=my_tensor)
# tensor([7., 1., -8., 3., -6., 0.])
my_tensor = torch.tensor([[[7.+0.j], [1.+0.j], [-8.+0.j]],
[[3.+0.j], [-6.+0.j], [0.+0.j]]])
torch.ravel(input=my_tensor)
# tensor([7.+0.j, 1.+0.j, -8.+0.j, 3.+0.j, -6.+0.j, 0.+0.j])
my_tensor = torch.tensor([[[True], [False], [True]],
[[False], [True], [False]]])
torch.ravel(input=my_tensor)
# tensor([True, False, True, False, True, False])
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