victor serbo, slacacat’2002, moscow, june 24-28, 20021 status of aida and jas 3 by victor serbo...

Victor Serbo, SLAC ACAT’2002, Moscow, June 24-28, 2002 1

Status of AIDA and JAS 3by Victor Serbo

• What is AIDA

• History/Collaboration/Documentation

• Some Details

• Examples

• Future plans

• JAS: Description and Status

• Conclusion


What is AIDA• Abstract Interfaces for Data Analysis (AIDA)

• “The goals of the AIDA project are to define abstract interfaces for common physics analysis objects, such as histograms, ntuples, fitters, IO etc.The adoption of these interfaces should make it easier for developers and users to select to use different tools without having to learn new interfaces or change their code. In addition it should be possible to exchange data (objects) between AIDA compliant applications.”


Abstract Interfaces

• Only define “protocol” that analysis objects have to understand, no internal details

• Can use object only through Abstract Interface• Define only pure virtual methods

– AIDA defines behavior, analysis tool provides implementation

• Use Factories to be able to switch implementations easily:– IAnalysisFactory af = IAnalysisFactory.create();


Motivation• Advantages

– The user needs to learn only one set of interfaces– Same user code can be used with different AIDA-compliant

analysis applications– Different analysis tools can exchange analysis objects

• same storage format, use functionality from other tools

– Pool experience of different developer teams• LHC++, OpenScientist, JAS

• Two versions of AIDA interfaces– One for C++– One for Java– As identical as possible


AIDA Example• Use same code with any AIDA-compliant analysis

tool.

A

I

D

A

User code (e.g. GEANT4)

Analysis tool 1

Analysis tool 2


History

• Initial idea formed during discussion at HepVis-99 workshop at Orsay– Informal AIDA discussions at CERN in 2000

– AIDA workshops:• January 2001 - Paris/Orsay

• April 2001 - Boston (preceding HepVis 2001)

• Informal meetings (e.g during Geant4 meetings and video conferences)

• June 2002 – CERN

– Interfaces have been designed by discussion and (eventual) consensus

• Takes some time, but result is well though out and robust


Organization - Developers

• No formal collaboration/author list.• Some people who have contributed (ideas, code,

etc).– Guy Barrand, Pavel Binko, Grzegorz Chwajol, Mark

Donszelmann, Wolfgang Hoschek, Tony Johnson, Emmanuel Medernach, Dino Ferrero Merlino, Lorenzo Moneta, Jakub Moscicki, Ioannis Papadopoulos, Andreas Pfeiffer, Max Sang, Victor Serbo, Max Turri

• Apologies to people accidentally missed


Organization – Code, Documentation

• AIDA – open source project– CVS repository: cvs.freehep.org

• “anonymous” download available

– Web page: http://aida.freehep.org• General information, relevant links

• Tutorial, users’ guide, examples

• Downloads and web-browsable source code

• Test cases (coming soon)


Current Status• AIDA Version 2.2 released (December 2001)

– First “End User” release– Three implementations of AIDA exist

• Anaphe/Lizard (C++)– http://anaphe.web.cern.ch/anaphe

• Open Scientist (C++)– http://www.lal.in2p3.fr/OpenScientist

• JAIDA/JAS (Java) + AIDA-JNI 1.0 (C++)– http://java.freehep.org/lib/freehep/doc/aida

– GEANT4 adopted AIDA for analysis

• AIDA 3.0 Currently under discussion– Release: end of September 2002


AIDA Interfaces Summary

• AIDA Factories

• ITuple

• IHistogram

• ICloud

• ITree


Example Program (Java)

• Create, fill, and view 1D and 2D histograms

• Factories:– Can switch

implementations without recompiling

– Framework can hide factories

l

;


ITuple

• ITuple - interface to the Data– “get/set” methods for double, float, int, …– Information about columns: min, max, mean, rms– Navigating: start(), next(), skip(int nRows)– Project ITuple into 1D, 2D, 3D histogram– New features for AIDA 3.0:

• Support for complex internal structures (subfolders)

• Chaining of ITuples


IHistogram (1D-3D)• Binned histogram: IHistogram1D, 2D, 3D

– “fill” methods (with/without weight)– Histogram info: entries, mean, rms, axis– Bin info: centre, entries, height, error– Histogram arithmetic: add, multiply, divide– Convenience methods, like coordinate-to-index

conversion


ICloud• Unbinned collection of points: ICloud1D, 2D, 3D

– Can represent scatter plot, dynamically rebinnable histogram

– Can be converted to a binned histogram– Standard “get/set” methods for entries– Collection info: lower, upper, mean, rms


IFunction and Fitting

• Fitting: IFunction, IFitFunction– IFunction – simple interface, allows to set parameters

and get function value

– IFitFunction – fit function to a histogram• Extends IFunction

• Various fit control methods: step size, bounds, etc.

• Allows to perform fit and get results

• AIDA 2.2 fitting functionality fairly limited

– AIDA 3.0 (Under discussion) extended functionality


ITree• ITree

– directory-like structure (Unix directory convention)• Methods like: cd, ls, mkdir, etc.

– AIDA analysis objects (tuples, histograms, clouds, ets.) exist within ITree directories

– “save/restore” functionality, hides storage details from the user

• Compatible with database or file storage• Can support multiple file formats• Mount/Unmount functionality (like unix) allows multiple stores

to be seamlessly merged• AIDA XML format is defined for data interchange


Future (unofficial ideas)

• Developer-level interfaces– Code sharing– More robust operation

• Put AIDA-based utilities in CVS – Utility to test AIDA implementations– User contributions

• Common binary storage format• More development in fitting interfaces

– IFitter, IOptimizer, IFitResult, IPlotter


JAS

• Java Analysis Studio (JAS)– Written entirely in Java – really portable

– Originally targeted at offline analysis – but also used extensively for online monitoring

– Rich, easy to use GUI• Can view trees, plots, HTML pages with embedded active objects

– Built-in editor/compiler for writing analysis code• Based on open source JEdit editor (pure Java editor, syntax

highlighting, auto indent, parenthesis matching, etc.)

– Local and Client-Server Operation• Access local or remote analysis objects

• Can send analysis code to the data and ship back only the results


JAS (continue)

• Java Analysis Studio– Modular/Extensible via Plugins

• Plugins extend basic JAS functionality– Define experiment-specific utilities (event display, analysis utilities,

specialized tables)– Add menus, create control areas, consoles, and output pages

• Data Format Independent through Data Interface Modules (DIM)– DIM is special type of Plugin – makes data available for JAS– DIMs exist for PAW, Root, Flat Files, SQL, stdHEP, HepTuples– You can write your own DIM for your data format

• Plugin examples: – Particle decay tree– WIRED event display


JAS GUIBuilt-in HTML viewer with embeddable “objects” (plots, buttons, etc.).

Pages can display histograms. User can control layout, add, remove plots.

Tree area provides access to analysis objects. Each item has popup menu and double-click action.

Plot Widget, shows data in real time, optimized for fast refresh performance.


JAS Usage

• BaBar Online Monitoring– Online Monitoring API– Static HTML pages with embedded live and reference

plots. Plots can be overlaid.

• US Linear Collider Studies– Have an entire recon+analysis package written in Java

• Using JAS as analysis interface• Making use of remote data access using repository at

University of Pennsylvania

• Other smaller scale users


JAS 3

• Major rewrite of many JAS components– Use AIDA interfaces and JAIDA implementation for

analysis: histograming, histogram arithmetic, fitting, tuples etc.

– The JAS plot widget will become the FreeHEP plotter– JAS itself will become a modular application framework,

into which various analysis components can be plugged. Major plugins will include WIRED, the JAS Plotter, and JAIDA.

– Scripting support (Jython ?)– New module Example: JAS Tuple Explorer, is being used

by the Babar Ambient Data explorer


Tuple Explorer• Display Tree

Leaves– Plot

– Histogram

– XY Plot

– Create new columns

– Apply cuts

• BaBar uses Tuple Explorer as Ambient DB browser

• Demo after talk


Conclusion

• AIDA is becoming mature project– Functionally sound – Regular meetings– Release schedule

• Next release of AIDA and AIDA-compliant analysis tools – September 2002

• JAS 3 – Easy to use and extend– Uses Java implementation of AIDA for analysis


Details (backup):

• Histogram

• Cloud

• Tuple

• Tree

• FreeHEP Plotter


Details - ITuple

• Interface to

the Data:


Details – IHistogram (1D-3D)

IHistogram:

Common functionality for all histograms (like entries, label, dimension,)

IHistogram1D

IHistogram2D

IHistogram3D


Details - ICloud• Unbinned collection of points: ICloud1D, 2D, 3D

– Can represent scatter plot, dynamically rebinnable histogram

– Can be automatically converted to a binned histogram

ICloud:

Common functionality for all histograms (like entries, label, dimension,)

ICloud1D

ICloud2D

ICloud3D


Details – ITree

• Directory-like

structures: ITree


Details - FreeHEP Plotter• FreeHEP Plotter The FreeHEP plotter will

be based on the existing JAS Plotter (JASHist), but with changes to add new features requested by users, a plugin structure to make adding new plot types easier, and a more flexible data model to make attaching various different data types possible. The FreeHEP plotter will fully support displaying all AIDA plots types.

• A partial list of design goals include:– Support for histogram, XYPlot, ScatterPlot, 2D color maps, lego plots, contour plots .. – Must be able to use any object as annotation or labels (arrows, latex, etc.) – Must be able to build complex plots (multiple axes, shared axes, etc.) – Extensible set of renderer – Extensible set of data source interfaces – Arbitrary map from axis to coordinate system (log, linear) – Support 2D and 3D drawing (and in principle also inventor, opengl etc.) – Able to support strings (sorted?), dates, numeric axis – Binned and non-binned axes, rebinning for binned axis – Output as postscript, SVG etc. – Variable bin size– Able to support legends, titles, annotations etc – Able to select a range in 1D and 2D plots for zooming, fitting in range, cuts etc – Labels should resize to fit bounds– Support for functions, directly setting initial values (next page …)


Details - FreeHEP Plotter (continue)

– User able to directly interact with objects, move them around (including outside plot boundaries)

– Property pages and popup menus for customization

– Arbitrary interactions between plot and data (rebinning, zooming etc.) – External objects should be able to insert (or delete) items into property

pages, popup menus

– Extensible using OO techniques (e.g. Specialized Axes) – Plot should be able to provide menus to external GUI – Saving/Restoring from XML

– Real time updating

– High performance (rapid updates)


June 2002 Developers Workshop

• 2 Day “Users Workshop” • 3 Day “Developer Workshop”

– Items under discussion• Fitting (two proposals, from SLAC, CERN)• Improved plotting (IPlotter)• Graph (XYData)• Tuple chaining, merging• Small updates/extensions to API

– Input/Participation from new people welcomed!

victor serbo, slacacat’2002, moscow, june 24-28, 20021 status of aida and jas 3 by victor serbo...

Documents

victor serbo

data analysis aida

status of aida

aida abstract interfaces

aida project

aidacompliant analysis

aida workshops

aida example