# sum¶

dragon.math.sum(
inputs,
axis=None,
keep_dims=False,
**kwargs
)[source]

Compute the sum value of elements along the given axis.

The argument axis could be negative or None:

x = dragon.constant([[1, 2, 3], [4, 5, 6]])

# A negative axis is the last-k axis
print(dragon.math.sum(x, 1))
print(dragon.math.sum(x, -1))  # Equivalent

# If axis is None, the vector-style reduction
# will be applied to return a scalar result
print(dragon.math.sum(x))  # Result is 21

# Also, axis could be a sequence of int
print(dragon.math.sum(x, [0, 1]))  # Result is 21

Parameters:
• inputs (dragon.Tensor) – The input tensor.
• axis (Union[int, Sequence[int]], optional) – The axis to reduce.
• keep_dims (bool, optional) – Keep the reduced dimensions or not.
Returns:

dragon.Tensor – The output tensor.