pub fn einsum<D, T>(format: &str, tensors: Vec<T>) -> TCResult<T> where
D: Dir,
T: TensorAccess + TensorMath<D, T, LeftCombine = T> + TensorTransform<Broadcast = T, Expand = T, Transpose = T> + TensorReduce<D, Reduce = T> + Clone + Display, 
pub fn einsum<D, T>(format: &str, tensors: Vec<T>) -> TCResult<T> where
D: Dir,
T: TensorAccess + TensorMath<D, T, LeftCombine = T> + TensorTransform<Broadcast = T, Expand = T, Transpose = T> + TensorReduce<D, Reduce = T> + Clone + Display,