Print `Trainable` as a column

[joonas-yoon]

🚀 Feature

New column in summary, Trainable determines whether gradients need to be computed.

We can know this from model's parameters easily:

for p in model.parameters():
    print(p.requires_grad)

In short, expected feature is:

_________________________________________________________________________________________________________
Layer                        Type                  Output Shape              Param #          Trainable
=========================================================================================================
vgg                          VGG                   (-1, 1000)                0                
├─features                   Sequential            (-1, 512, 7, 7)           0                
|    └─0                     Conv2d                (-1, 64, 224, 224)        1,792            True
|    └─1                     ReLU                  (-1, 64, 224, 224)        0                -
|    └─2                     Conv2d                (-1, 64, 224, 224)        36,928           True
|    └─3                     ReLU                  (-1, 64, 224, 224)        0                -
|    └─4                     MaxPool2d             (-1, 64, 112, 112)        0                
|    └─5                     Conv2d                (-1, 128, 112, 112)       73,856           True
|    └─6                     ReLU                  (-1, 128, 112, 112)       0                -
...
├─classifier                 Sequential            (-1, 1000)                0                
|    └─0                     Linear                (-1, 4096)                102,764,544      False
|    └─1                     ReLU                  (-1, 4096)                0                -
|    └─2                     Dropout               (-1, 4096)                0                -
|    └─3                     Linear                (-1, 4096)                16,781,312       False
|    └─4                     ReLU                  (-1, 4096)                0                -
|    └─5                     Dropout               (-1, 4096)                0                -
|    └─6                     Linear                (-1, 1000)                4,097,000        False

Motivation & pitch

I have been trying transfering model with DenseNet, and got summary.

model = torchvision.models.densenet201(pretrained=True)
model.classifier = nn.Sequential(
    nn.Linear(1920, 10)
)
for p in model.classifier.parameters():
    p.requires_grad = False
summary(model, (3, 224, 224))

but there is no information which layer is trainable. this is the tail of result.

|    |    |    └─conv2       Conv2d                (-1, 32, 7, 7)            36,864         
|    └─norm5                 BatchNorm2d           (-1, 1920, 7, 7)          7,681          
├─classifier                 Sequential            (-1, 10)                  0              
|    └─0                     Linear                (-1, 10)                  19,210         
==========================================================================================
Trainable params: 18,092,928
Non-trainable params: 19,210
Total params: 18,112,138

Alternatives

No response

Additional context

I will wait for your response. I want to hear what you think about this.

[frgfm]

Hi @joonas-yoon 👋

This is an interesting feature idea! Here is some feedback:

• there can be mutliple params in one layer
• for torchscan to check backprop RAM consumption, we need the parameters to require the grad

What do you think?

[joonas-yoon]

Could you give me one example for multiple parameters? I have no idea about it but interesting.

[joonas-yoon]

and for second thing, RAM consumption, how about save all of its state and restore them?

obviously, it have to take more time and less performance. any idea?

[frgfm]

Hey there 👋

Well, for multiple parameters, almost all layers 😅

from torch import nn

# Create a fully connected layer
layer = nn.Linear(4, 8)
# Don't track grad on the weights
layer.weight.requires_grad_(False)

# But the bias is still loose
for n, p in layer.named_parameters():
    print(n, p.requires_grad)

which yields:

weight False
bias True

For the second part, I had the same in mind, I agree 👍

[joonas-yoon]

Oh I see. then, only for having different one, how about this?

_______________________________________________________________________________________________________________
Layer                        Type                  Output Shape              Param #          Trainable
===============================================================================================================
vgg                          VGG                   (-1, 1000)                0                
...
|    └─3                     Linear                (-1, 4096)                16,781,312       False
|    └─4                     ReLU                  (-1, 4096)                0                -
|    └─5                     Dropout               (-1, 4096)                0                -
|    └─6                     Linear                (-1, 1000)                4,097,000        weight: False
|                                                                                             bias: True

no matter it has multiple lines. it's okay with single line as like weight: False, bias: True. but it prints too long string 🤔

[frgfm]

Well, that will become hairy, I honestly don't want to spread on multiple lines. The only suggestion I can see is:

• write True if any parameter is trainable
• write False otherwise

[joonas-yoon]

good, I totally agree with you.

one thing I want to suggest is, it needs to be noticed from documentation. for example, "False; contains partial mixed-trainable parameters"