mindspore.numpy.isclose(a, b, rtol=1e-05, atol=1e-08, equal_nan=False)[source]

Returns a boolean tensor where two tensors are element-wise equal within a tolerance.

The tolerance values are positive, typically very small numbers. The relative difference (\(rtol * abs(b)\)) and the absolute difference atol are added together to compare against the absolute difference between a and b.


For finite values, isclose uses the following equation to test whether two floating point values are equivalent. \(absolute(a - b) <= (atol + rtol * absolute(b))\) On Ascend, input arrays containing inf or NaN are not supported.

  • a (Union[Tensor, list, tuple]) – Input first tensor to compare.

  • b (Union[Tensor, list, tuple]) – Input second tensor to compare.

  • rtol (numbers.Number) – The relative tolerance parameter (see Note).

  • atol (numbers.Number) – The absolute tolerance parameter (see Note).

  • equal_nan (bool) – Whether to compare NaN as equal. If True, NaN in a will be considered equal to NaN in b in the output tensor. Default: False.


A bool tensor of where a and b are equal within the given tolerance.


TypeError – If inputs have types not specified above.

Supported Platforms:

Ascend GPU CPU


>>> a = np.array([0,1,2,float('inf'),float('inf'),float('nan')])
>>> b = np.array([0,1,-2,float('-inf'),float('inf'),float('nan')])
>>> print(np.isclose(a, b))
[ True  True False False  True False]
>>> print(np.isclose(a, b, equal_nan=True))
[ True  True False False  True  True]