Add timestamps for video 29: Luciano (#25)

* Add timestamps for Luciano

* add leading zero

* formatting of time

Co-authored-by: Reshama Shaikh <[email protected]>

videos-list/29-luciano.md

@@ -13,9 +13,26 @@ Discourse Discussion
 https://discourse.pymc.io/t/posterior-predictive-sampling-in-pymc3-by-luciano-paz/6028
 
 ## Timestamps
-- 0:00 Start of event
-- x:xx 
-- x:xx
+00:00 Start of event
+00:22 Background on PyMC3 common workflow and posterior predictive distribution
+02:56 What is this presentation about?
+03:19 Simple model without posterior predictive problems
+04:27 Create train and test data
+05:12 Translate the math into PyMC3
+06:52 Visualize and plot the model and predictions
+08:20 Make predictions on the new data
+09:29 Shape problems 
+12:46 A simple extension of linear regression
+17:26 View the results of the extension
+17:50 Error on the test data
+19:15 What happens if we try to marginalize label out of the model?
+21:38 Shape problem with the test data
+22:55 Solution, a functional approach 
+27:50 Factory functions aren’t a silver bullet
+28:12 Manually trim the inferred posterior
+29:22 Challenges with sampling 
+32:10 How can PyMC help?
+32:45 Conclusion
 
 ## Note: help us add timestamps here
 https://github.com/pymc-devs/video-timestamps