The definition of phase-locking value(PLV) in python-mne is correct?

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Please allow me to express my gratitude to your software,python-mne. I am a college student on neuroscience. In the following page, I found the PLV definition is given : PLV = |E[Sxy/|Sxy|]|.

The definition is different from that of in the reference ?Measuring phase synchrony in brain signals?.

Are these two equivalent or it is a mistake?I am looking forward to getting your help.

Best regards!
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