Community Bonding Period

Now that the coding period for this year’s Summer of Code is about to start, I am extremely happy that things have been working pretty well with me and my mentors over this community bonding period. We had a group meeting on IRC and all of us are excited to have  a more than successful Summer of Code.

---

Community Bonding Period

In the community bonding period,I reviewed my proposal again and discussed with my mentors about what features are necessary, how things should be implemented and cleared my doubts. I read the documentation, read the code  to understand the flow of execution and how things have been implemented.

I read the documentation of pyparsing module which would  be used for parsing UAI file format. Here are some of the notes which i created from the documentation so that i can easily find around some functions which would be needed in the later stage.

1. import pyparsing module as import pyparsing as pp.
2. p.parseString(s) → input is “s” and parser is “p” .If the syntax of s matches the syntax described by p, this expression will return an object that represents the parts that matched. This object will be an instance of class pp.ParseResults.
3. pp.Word() class produces a parser that matches a string of letters defined by its first argument
4. Use pp.Group(phrase) to group things. For example to differentiate models with variable numbers use pp.Group().
5. Use setResultsName() to give name to the string which is returned for ex model_name = pp.Word(pp.alphas).setResultsName('modelName')

I also made the grammar for the UAI module.

Grammar for UAI Preamble:

Preamble --> model_name \n no_variables

model_name --> MARKOV | BAYES

no_variables --> IntegerNumber \n domain_variables

domain_variables --> IntegerNumber* \n no_functions

no_functions --> IntegerNumber \n function_definition*

function_definition* --> function_definition | function_definition function_definition*

function_definition --> size_function " " IntegerNumber*