Variable name bug in block.AbstractInput

[fangwei123456]

Objective of issue:

Lava DL version:

• 0.3.0 (feature release)
• 0.2.1 (bug fixes)
• 0.2.0 (current version)
• 0.1.2

Lava version:

• 0.4.0 (feature release)
• 0.3.1 (bug fixes)
• 0.3.0 (current version)
• 0.2.0
• 0.1.2

I'm submitting a ...

• bug report
• feature request
• documentation request

Current behavior:

Traceback (most recent call last):
  File "/home/wfang/spikingjelly_dev/spikingjelly/test.py", line 6, in <module>
    print(net(torch.rand([1, 2, 3])))
  File "/home/wfang/anaconda3/envs/lava-env/lib/python3.10/site-packages/torch/nn/modules/module.py", line 1130, in _call_impl
    return forward_call(*input, **kwargs)
  File "/home/wfang/anaconda3/envs/lava-env/lib/python3.10/site-packages/lava/lib/dl/slayer/block/base.py", line 94, in forward
    self.input_shape = input.shape[1:-1]
AttributeError: 'builtin_function_or_method' object has no attribute 'shape'

Expected behavior:

• No error is raised.

Steps to reproduce:

• Please run codes in Related code.

Related code:

import torch
from lava.lib.dl import slayer

net = slayer.block.cuba.Input()
print(net(torch.rand([1, 2, 3])))

Other information: