AudioCLIP eval mode gives different output

I was looking at the `AudioCLIPEncoder` and tried running the AudioCLIP demo here:

https://github.com/AndreyGuzhov/AudioCLIP/blob/master/demo/AudioCLIP.ipynb

I found that if we replace this line:

`aclp = AudioCLIP(pretrained=f'../assets/{MODEL_FILENAME}')`

with

`aclp = AudioCLIP(pretrained=f'../assets/{MODEL_FILENAME}').eval()`

the results returned are different and accuracy is lower in eval mode.

Unfortunately, since the original mode does not support input of batch size 1, we are currently using `eval` mode in our `AudioCLIPEncoder` .

I will file an issue in the `AudioCLIP` repo, but also filing an issue here to keep track of things.