PFPGrowthPlus
- class PAMI.periodicFrequentPattern.basic.PFPGrowthPlus.PFPGrowthPlus(iFile, minSup, maxPer, sep='\t')[source]
Bases:
_periodicFrequentPatterns- Description:
PFPGrowthPlus is fundamental and improved version of PFPGrowth algorithm to discover periodic-frequent patterns in temporal database. It uses greedy approach to discover effectively
- Reference:
R. UdayKiran, MasaruKitsuregawa, and P. KrishnaReddyd, “Efficient discovery of periodic-frequent patterns in very large databases,” Journal of Systems and Software February 2016 https://doi.org/10.1016/j.jss.2015.10.035
- param iFile:
str : Name of the Input file to mine complete set of periodic frequent pattern’s
- param oFile:
str : Name of the output file to store complete set of periodic frequent pattern’s
- param minSup:
str: Controls the minimum number of transactions in which every item must appear in a database.
- param maxPer:
str: Controls the maximum number of transactions in which any two items within a pattern can reappear.
- param sep:
str : This variable is used to distinguish items from one another in a transaction. The default seperator is tab space. However, the users can override their default separator.
- Attributes:
- iFilefile
Name of the Input file or path of the input file
- oFilefile
Name of the output file or path of the output file
- minSupint or float or str
The user can specify minSup either in count or proportion of database size. If the program detects the data type of minSup is integer, then it treats minSup is expressed in count. Otherwise, it will be treated as float. Example: minSup=10 will be treated as integer, while minSup=10.0 will be treated as float
- maxPerint or float or str
The user can specify maxPer either in count or proportion of database size. If the program detects the data type of maxPer is integer, then it treats maxPer is expressed in count. Otherwise, it will be treated as float. Example: maxPer=10 will be treated as integer, while maxPer=10.0 will be treated as float
- sepstr
This variable is used to distinguish items from one another in a transaction. The default seperator is tab space or . However, the users can override their default separator.
- memoryUSSfloat
To store the total amount of USS memory consumed by the program
- memoryRSSfloat
To store the total amount of RSS memory consumed by the program
- startTime:float
To record the start time of the mining process
- endTime:float
To record the completion time of the mining process
- Databaselist
To store the transactions of a database in list
- mapSupportDictionary
To maintain the information of item and their frequency
- lnoint
it represents the total no of transaction
- treeclass
it represents the Tree class
- itemSetCountint
it represents the total no of patterns
- finalPatternsdict
it represents to store the patterns
- Methods:
- mine()
Mining process will start from here
- getPatterns()
Complete set of patterns will be retrieved with this function
- save(oFile)
Complete set of periodic-frequent patterns will be loaded in to a output file
- getPatternsAsDataFrame()
Complete set of periodic-frequent patterns will be loaded in to a dataframe
- getMemoryUSS()
Total amount of USS memory consumed by the mining process will be retrieved from this function
- getMemoryRSS()
Total amount of RSS memory consumed by the mining process will be retrieved from this function
- getRuntime()
Total amount of runtime taken by the mining process will be retrieved from this function
- check(line)
To check the delimiter used in the user input file
- creatingItemSets(fileName)
Scans the dataset or dataframes and stores in list format
- PeriodicFrequentOneItem()
Extracts the one-periodic-frequent patterns from Databases
- updateDatabases()
update the Databases by removing aperiodic items and sort the Database by item decreased support
- buildTree()
after updating the Databases ar added into the tree by setting root node as null
- mine()
the main method to run the program
Methods to execute code on terminal
Format: (.venv) $ python3 PFPGrowthPlus.py <inputFile> <outputFile> <minSup> <maxPer> Example: (.venv) $ python3 PFPGrowthPlus.py sampleTDB.txt patterns.txt 0.3 0.4 .. note:: minSup will be considered in percentage of database transactions
Importing this algorithm into a python program
from PAMI.periodicFrequentPattern.basic import PFPGorwthPlus as alg obj = alg.PFPGrowthPlus("../basic/sampleTDB.txt", "2", "6") obj.startMine() periodicFrequentPatterns = obj.getPatterns() print("Total number of Periodic Frequent Patterns:", len(periodicFrequentPatterns)) obj.save("patterns") Df = obj.getPatternsAsDataFrame() memUSS = obj.getMemoryUSS() print("Total Memory in USS:", memUSS) memRSS = obj.getMemoryRSS() print("Total Memory in RSS", memRSS) run = obj.getRuntime() print("Total ExecutionTime in seconds:", run)
The complete program was written by P.Likhitha under the supervision of Professor Rage Uday Kiran.
- getMemoryRSS() float[source]
Total amount of RSS memory consumed by the mining process will be retrieved from this function
- Returns:
returning RSS memory consumed by the mining process
- Return type:
float
- getMemoryUSS() float[source]
Total amount of USS memory consumed by the mining process will be retrieved from this function
- Returns:
returning USS memory consumed by the mining process
- Return type:
float
- getPatterns() Dict[str, Tuple[int, int]][source]
Function to send the set of periodic-frequent patterns after completion of the mining process
- Returns:
returning periodic-frequent patterns
- Return type:
dict
- getPatternsAsDataFrame() DataFrame[source]
Storing final periodic-frequent patterns in a dataframe
- Returns:
returning periodic-frequent patterns in a dataframe
- Return type:
pd.DataFrame
- getRuntime() float[source]
Calculating the total amount of runtime taken by the mining process
- Returns:
returning total amount of runtime taken by the mining process
- Return type:
float