Returns the mean value of all elements in the x tensor.
    
     
    tch_mean(x, dim = NULL, keepdim = FALSE)
    
    Arguments
    
    
    
      | x | 
      tensor object  | 
    
    
      | dim | 
      the dimension to reduce  | 
    
    
      | keepdim | 
      whether the output tensor has dim retained or not. (ignored if dim is NULL)  | 
    
    
    
    Examples
    #> tensor 
#> 0.493348
#> [ Variable[CPUFloatType]{} ]