The current way (according to 1.26 doc) of setting and resetting error is
```
old_settings = np.seterr(all='ignore') #seterr to known value
np.seterr(over='raise')
{'divide': 'ignore', 'over': 'ignore', 'under': 'ignore', 'invalid': 'ignore'}
np.seterr(**old_settings) # reset to default
```
This may be tedious and not elegant when we need to suppress the error for some
certain lines, for example, `np.nan_to_num(a/b) ` as we need to suppress divide
here.
I think it would be way more elegant to use `with` statement here, which should
be able to be implemented with some simple changes.
An ideal result would be like:
```
with np.seterr(divide='ignore'):
np.nan_to_num(a/b) # no warning
a/0 # still warn
```
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