Incorrect variable name: `self.ev_values`

[nameearly]

engine.py:2838-2846:

• The code incorrectly uses self.ev_values[i][0]
• In the context, only a local variable is defined: ev_values = self.block_eigenvalue.values()
• I found no definition or assignment of self.ev_values anywhere in the same file (it appears out of nowhere in this scope)

Result: When the branch conditions are met (monitor.enabled + GA boundary + rank0 + eigenvalue condition), this line will throw AttributeError: 'DeepSpeedEngine' object has no attribute 'ev_values'. This causes the eigenvalue-related monitoring log writing to fail (and may even prevent a single monitor.write_events call from executing).

Additional hidden prerequisite issue:

dict.values() returns a dict_values view object in Python 3, which does not support indexing. The current code:

ev_values = self.block_eigenvalue.values()
for i in range(len(ev_values)):
    ...

• len(ev_values) works on dict_values
• But even if you fix self.ev_values to ev_values[i], it will still throw a TypeError because dict_values is not subscriptable

Fix required: Convert ev_values to an indexable sequence (e.g., list(self.block_eigenvalue.values())) to access values via index i correctly.