Instrumental Variable validity

I have a big graph and I used DoWhy to do inference with instrumental variables. I wanted to confirm that the instrumental variables were valid. To my knowledge give the graph below:
1- IV should be independent of u (low correlation)
2- IV and outcome should be dependent (high correlation)
3- IV and outcome should be independent given TREAT (low partial correlation)


To verify those assumptions I calculated correlations and partial correlations. Surprisingly IV and OUTCOME are strongly correlated (partial …

big correlation datascience dowhy graph independent inference knowledge low the graph variables