Thanks for the reply. I figured out that the following code can help here
for item in embeddingLists:       
    tempItem = [stuff.unsqueeze(0)  for stuff in item]
    coomn = torch.cat(tempItem)             
    temMean = torch.mean(coomn,dim=0)
    meanVects.append(temMean)
    temVar = torch.var(coomn,dim=0)
    varVects.append(temVar)