`resnet_v2`-models can cause out of memory error

[Anselmoo]

Bug Description

In the case of using resnet_v2-models, an out-of-memory error can be generated.

Expected Behavior

Instead of crashing and generating an out-of-memory error, the currently used model should be skipped.

Setup Details

Include the details about the versions of:

• OS type and version: Ubuntu 20
• Python: 3.8
• autokeras: latest version

Additional context

See also discussion: #1721

[Anselmoo]

See also:

https://github.com/keras-team/autokeras/blob/master/autokeras/utils/utils.py#L87