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NAME
    TopologicalPharmacophoreAtomPairsFingerprints

SYNOPSIS
    use Fingerprints::TopologicalPharmacophoreAtomPairsFingerprints;

    use Fingerprints::TopologicalPharmacophoreAtomPairsFingerprints
    qw(:all);

DESCRIPTION
    TopologicalPharmacophoreAtomPairsFingerprints [ Ref 60-62, Ref 65, Ref
    68 ] class provides the following methods:

    new, GenerateFingerprints, GetDescription, GetAtomPairIDs,
    SetAtomTypesToUse, SetAtomTypesWeight, SetFuzzFactor,
    SetFuzzificationMethodology, SetFuzzificationMode, SetMaxDistance,
    SetMinDistance, SetNormalizationMethodology, SetValuesPrecision,
    StringifyTopologicalPharmacophoreAtomPairsFingerprints

    TopologicalPharmacophoreAtomPairsFingerprints is derived from
    Fingerprints class which in turn is derived from ObjectProperty base
    class that provides methods not explicitly defined in
    TopologicalPharmacophoreAtomPairsFingerprints, Fingerprints or
    ObjectProperty classes using Perl's AUTOLOAD functionality. These
    methods are generated on-the-fly for a specified object property:

        Set<PropertyName>(<PropertyValue>);
        $PropertyValue = Get<PropertyName>();
        Delete<PropertyName>();

    Based on the values specified for AtomTypesToUse, pharmacophore atom
    types are assigned to all non-hydrogen atoms in a molecule and a
    distance matrix is generated. A pharmacophore atom pairs basis set is
    initialized for all unique possible pairs within MinDistance and
    MaxDistance range.

        Let:

        P = Valid pharmacophore atom type

        Px = Pharmacophore atom type x
        Py = Pharmacophore atom type y

        Dmin = Minimum distance corresponding to number of bonds between two atoms
        Dmax = Maximum distance corresponding to number of bonds between two atoms
        D = Distance corresponding to number of bonds between two atoms

        Px-Dn-Py = Pharmacophore atom pair ID for atom types Px and Py at distance Dn

        P = Number of pharmacophore atom types to consider
        PPDn = Number of possible unique pharmacophore atom pairs at a distance Dn

        PPT = Total number of possible pharmacophore atom pairs at all distances between Dmin and Dmax

        Then:

        PPD =  (P * (P - 1))/2 + P

        PPT = ((Dmax - Dmin) + 1) * ((P * (P - 1))/2 + P)
            = ((Dmax - Dmin) + 1) * PPD

        So for default values of Dmin = 1, Dmax = 10 and P = 5,

        PPD =  (5 * (5 - 1))/2 + 5 = 15
        PPT = ((10 - 1) + 1) * 15 = 150

        The pharmacophore atom pairs bais set includes 150 values.

        The atom pair IDs correspond to:

        Px-Dn-Py = Pharmacophore atom pair ID for atom types Px and Py at distance Dn

        For example: H-D1-H, H-D2-HBA, PI-D5-PI and so on

    Using distance matrix and pharmacohore atom types, occurrence of unique
    pharmacohore atom pairs is counted. The contribution of each atom type
    to atom pair interaction is optionally weighted by specified
    AtomTypesWeight before assigning its count to appropriate distance bin.
    Based on NormalizationMethodology option, pharmacophore atom pairs count
    is optionally normalized. Additionally, pharmacohore atom pairs count is
    optionally fuzzified before or after the normalization controlled by
    values of FuzzifyAtomPairsCount, FuzzificationMode,
    FuzzificationMethodology and FuzzFactor.

    The final pharmacophore atom pairs count along with atom pair
    identifiers involving all non-hydrogen atoms, with optional
    normalization and fuzzification, constitute pharmacophore topological
    atom pairs fingerprints of the molecule.

    For *ArbitrarySize* value of AtomPairsSetSizeToUse, the fingerprint
    vector correspond to only those topological pharmacophore atom pairs
    which are present and have non-zero count. However, for *FixedSize*
    value of AtomPairsSetSizeToUse, the fingerprint vector contains all
    possible valid topological pharmacophore atom pairs with both zero and
    non-zero count values.

    The current release of MayaChemTools generates the following types of
    topological pharmacophore atom pairs fingerprints vector strings:

        FingerprintsVector;TopologicalPharmacophoreAtomPairs:ArbitrarySize:Min
        Distance1:MaxDistance10;54;NumericalValues;IDsAndValuesString;H-D1-H H
        -D1-NI HBA-D1-NI HBD-D1-NI H-D2-H H-D2-HBA H-D2-HBD HBA-D2-HBA HBA-D2-
        HBD H-D3-H H-D3-HBA H-D3-HBD H-D3-NI HBA-D3-NI HBD-D3-NI H-D4-H H-D4-H
        BA H-D4-HBD HBA-D4-HBA HBA-D4-HBD HBD-D4-HBD H-D5-H H-D5-HBA H-D5-...;
        18 1 2 1 22 12 8 1 2 18 6 3 1 1 1 22 13 6 5 7 2 28 9 5 1 1 1 36 16 10
        3 4 1 37 10 8 1 35 10 9 3 3 1 28 7 7 4 18 16 12 5 1 2 1

        FingerprintsVector;TopologicalPharmacophoreAtomPairs:FixedSize:MinDist
        ance1:MaxDistance10;150;OrderedNumericalValues;ValuesString;18 0 0 1 0
        0 0 2 0 0 1 0 0 0 0 22 12 8 0 0 1 2 0 0 0 0 0 0 0 0 18 6 3 1 0 0 0 1
        0 0 1 0 0 0 0 22 13 6 0 0 5 7 0 0 2 0 0 0 0 0 28 9 5 1 0 0 0 1 0 0 1 0
        0 0 0 36 16 10 0 0 3 4 0 0 1 0 0 0 0 0 37 10 8 0 0 0 0 1 0 0 0 0 0 0
        0 35 10 9 0 0 3 3 0 0 1 0 0 0 0 0 28 7 7 4 0 0 0 0 0 0 0 0 0 0 0 18...

        FingerprintsVector;TopologicalPharmacophoreAtomPairs:FixedSize:MinDist
        ance1:MaxDistance10;150;OrderedNumericalValues;IDsAndValuesString;H-D1
        -H H-D1-HBA H-D1-HBD H-D1-NI H-D1-PI HBA-D1-HBA HBA-D1-HBD HBA-D1-NI H
        BA-D1-PI HBD-D1-HBD HBD-D1-NI HBD-D1-PI NI-D1-NI NI-D1-PI PI-D1-PI H-D
        2-H H-D2-HBA H-D2-HBD H-D2-NI H-D2-PI HBA-D2-HBA HBA-D2-HBD HBA-D2...;
        18 0 0 1 0 0 0 2 0 0 1 0 0 0 0 22 12 8 0 0 1 2 0 0 0 0 0 0 0 0 18 6 3
        1 0 0 0 1 0 0 1 0 0 0 0 22 13 6 0 0 5 7 0 0 2 0 0 0 0 0 28 9 5 1 0 0 0
        1 0 0 1 0 0 0 0 36 16 10 0 0 3 4 0 0 1 0 0 0 0

  METHODS
    new
            $TPAPFP = new TopologicalPharmacophoreAtomPairsFingerprints(
                                                           %NamesAndValues);

        Using specified *TopologicalPharmacophoreAtomPairsFingerprints*
        property names and values hash, new method creates a new object and
        returns a reference to newly created
        TopologicalPharmacophoreAtomPairsFingerprints object. By default,
        the following properties are initialized:

            Molecule = ''
            Type = 'TopologicalPharmacophoreAtomPairs'
            MinDistance = 1
            MaxDistance = 10
            NormalizationMethodology = 'None'
            AtomTypesToUse = ['HBD', 'HBA', 'PI', 'NI', 'H']

            FuzzifyAtomPairsCount = 0
            FuzzificationMode = 'AfterNormalization'
            FuzzificationMethodology =  'FuzzyBinning'
            FuzzFactor = 0.15

            ValuesPrecision = 2

        Examples:

            $TPAPFP = new TopologicalPharmacophoreAtomPairsFingerprints(
                                      'Molecule' => $Molecule);

            $TPAPFP = new TopologicalPharmacophoreAtomPairsFingerprints(
                                      'Molecule' => $Molecule,
                                      'AtomPairsSetSizeToUse' => 'ArbitrarySize',
                                      'MinDistance' => 1,
                                      'MaxDistance' => 10,
                                      'NormalizationMethodology' => 'None',
                                      'AtomTypesToUse' => ['HBD', 'HBA', 'PI', 'NI', 'H'],
                                      'FuzzifyAtomPairsCount' => 0);

            $TPAPFP = new TopologicalPharmacophoreAtomPairsFingerprints(
                                      'Molecule' => $Molecule,
                                      'AtomPairsSetSizeToUse' => 'FizedSize',
                                      'MinDistance' => 1,
                                      'MaxDistance' => 10,
                                      'NormalizationMethodology' => 'None',
                                      'AtomTypesToUse' => ['HBD', 'HBA', 'PI', 'NI', 'H'],
                                      'FuzzifyAtomPairsCount' => 1,
                                      'FuzzificationMethodology' => 'FuzzyBinning',
                                      'FuzzFactor' => 0.15,
                                      'ValuesPrecision' => 2);

            $TPAPFP->GenerateFingerprints();
            print "$TPAPFP\n";

    GetDescription
            $Description = $TopologicalPharmacophoreAtomPairsFP->GetDescription();

        Returns a string containing description of topological pharmacophore
        atom pairs fingerprints.

    GenerateFingerprints
            $TopologicalPharmacophoreAtomPairsFP->GenerateFingerprints();

        Generates topological pharmacophore atom pairs fingerprints and
        returns *TopologicalPharmacophoreAtomPairsFP*.

    GetAtomPairIDs
            $AtomPairIDsRef = $TopologicalPharmacophoreAtomPairsFP->GetAtomPairIDs();
            @AtomPairIDs = $TopologicalPharmacophoreAtomPairsFP->GetAtomPairIDs();

        Returns atom pair IDs corresponding to atom pairs count values in
        topological pharmacophore atom pairs fingerprints vector as an array
        or reference to an array.

    SetAtomPairsSetSizeToUse
            $TopologicalPharmacophoreAtomPairsFP->SetAtomPairsSetSizeToUse($Values);

        Sets pharmacophore atom pairs set size to use for topological
        pharmacophore fingerprints generation and returns
        *TopologicalPharmacophoreAtomPairsFingerprints*.

        Possible values for pharmacophore atom pairs set size are:
        *ArbitrarySize, FizedSize*. Default value: *ArbitrarySize*.

        For *ArbitrarySize* value of AtomPairsSetSizeToUse, the fingerprint
        vector correspond to only those topological pharmacophore atom pairs
        which are present and have non-zero count. However, for *FixedSize*
        value of AtomPairsSetSizeToUse, the fingerprint vector contains all
        possible valid topological pharmacophore atom pairs with both zero
        and non-zero count values.

    SetAtomTypesToUse
            $TopologicalPharmacophoreAtomPairsFP->SetAtomTypesToUse($ValuesRef);
            $TopologicalPharmacophoreAtomPairsFP->SetAtomTypesToUse(@Values);

        Sets pharmacophore atom types to use for topological pharmacophore
        fingerprints generation and returns
        *TopologicalPharmacophoreAtomPairsFingerprints*.

        Possible values for pharmacophore atom types are: *Ar, CA, H, HBA,
        HBD, Hal, NI, PI, RA*. Default value [ Ref 60-62 ] :
        *HBD,HBA,PI,NI,H*.

        The pharmacophore atom types abbreviations correspond to:

            HBD: HydrogenBondDonor
            HBA: HydrogenBondAcceptor
            PI :  PositivelyIonizable
            NI : NegativelyIonizable
            Ar : Aromatic
            Hal : Halogen
            H : Hydrophobic
            RA : RingAtom
            CA : ChainAtom

        *AtomTypes::FunctionalClassAtomTypes* module is used to assign
        pharmacophore atom types. It uses following definitions [ Ref 60-61,
        Ref 65-66 ]:

            HydrogenBondDonor: NH, NH2, OH
            HydrogenBondAcceptor: N[!H], O
            PositivelyIonizable: +, NH2
            NegativelyIonizable: -, C(=O)OH, S(=O)OH, P(=O)OH

    SetAtomTypesWeight
            $TopologicalPharmacophoreAtomPairsFP->SetAtomTypesWeight(
                %AtomTypesToWeight);

        Sets weights of specified pharmacophore atom types to use during
        calculation of their contribution to atom pair count and returns
        *TopologicalPharmacophoreAtomPairsFP*. Default values: *1 for each
        atom type*.

        The weight values allow to increase the importance of specific
        pharmacophore atom type in the generated fingerprints. A weight
        value of 0 for an atom type eliminates its contribution to atom pair
        count where as weight value of 2 doubles its contribution.

    SetFuzzFactor
            $TopologicalPharmacophoreAtomPairsFP->SetFuzzFactor($Value);

        Sets fuzz factor value to use during fuzzification of atom pairs
        count and returns *TopologicalPharmacophoreAtomPairsFP*. Default
        value: *0.15*.

        Valid values: For *FuzzyBinning* value of FuzzificationMethodology:
        *between 0 and 1.0*; For *FuzzyBinSmoothing* value of
        FuzzificationMethodology: *between 0 and 0.5*.

    SetFuzzificationMethodology
            $TopologicalPharmacophoreAtomPairsFP->SetFuzzificationMethodology($Value);

        Sets fuzzification methodology to use for fuzzification of atom
        pairs count and returns *TopologicalPharmacophoreAtomPairsFP*.
        Default value: *FuzzyBinning*. Possible values: *FuzzyBinning |
        FuzzyBinSmoothing*.

        In conjunction with values for options FuzzifyAtomPairsCount,
        FuzzificationMode and FuzzFactor, FuzzificationMethodology option is
        used to fuzzify pharmacophore atom pairs count.

        Let:

            Px = Pharmacophore atom type x
            Py = Pharmacophore atom type y
            PPxy = Pharmacophore atom pair between atom type Px and Py

            PPxyDn = Pharmacophore atom pairs count between atom type Px and Py
                     at distance Dn
            PPxyDn-1 = Pharmacophore atom pairs count between atom type Px and Py
                       at distance Dn - 1
            PPxyDn+1 = Pharmacophore atom pairs count between atom type Px and Py
                       at distance Dn + 1

            FF = FuzzFactor for FuzzyBinning and FuzzyBinSmoothing

        Then:

        For *FuzzyBinning*:

            PPxyDn = PPxyDn (Unchanged)

            PPxyDn-1 = PPxyDn-1 + PPxyDn * FF
            PPxyDn+1 = PPxyDn+1 + PPxyDn * FF

        For *FuzzyBinSmoothing*:

            PPxyDn = PPxyDn - PPxyDn * 2FF for Dmin < Dn < Dmax
            PPxyDn = PPxyDn - PPxyDn * FF for Dn = Dmin or Dmax

            PPxyDn-1 = PPxyDn-1 + PPxyDn * FF
            PPxyDn+1 = PPxyDn+1 + PPxyDn * FF

        In both fuzzification schemes, a value of 0 for FF implies no
        fuzzification of occurrence counts. A value of 1 during
        *FuzzyBinning* corresponds to maximum fuzzification of occurrence
        counts; however, a value of 1 during *FuzzyBinSmoothing* ends up
        completely distributing the value over the previous and next
        distance bins.

        So for default value of FuzzFactor (FF) 0.15, the occurrence count
        of pharmacohore atom pairs at distance Dn during FuzzyBinning is
        left unchanged and the counts at distances Dn -1 and Dn + 1 are
        incremented by PPxyDn * 0.15.

        And during *FuzzyBinSmoothing* the occurrence counts at Distance Dn
        is scaled back using multiplicative factor of (1 - 2*0.15) and the
        occurrence counts at distances Dn -1 and Dn + 1 are incremented by
        PPxyDn * 0.15. In other words, occurrence bin count is smoothed out
        by distributing it over the previous and next distance value.

    SetFuzzificationMode
            $TopologicalPharmacophoreAtomPairsFP->SetFuzzificationMode($Value);

        Sets fuzzification mode to use for fuzzification of atom pairs count
        and returns *TopologicalPharmacophoreAtomPairsFP*. Default value:
        *AfterNormalization*. Possible values: *BeforeNormalization |
        AfterNormalization*.

    SetMaxDistance
            $TopologicalPharmacophoreAtomPairsFP->SetMaxDistance($Value);

        Sets maximum bond distance between atom pairs for generating
        topological pharmacophore atom pairs fingerprints and returns
        *TopologicalPharmacophoreAtomPairsFP*.

    SetMinDistance
            $TopologicalPharmacophoreAtomPairsFP->SetMinDistance($Value);

        Sets minimum bond distance between atom pairs for generating
        topological pharmacophore atom pairs fingerprints and returns
        *TopologicalPharmacophoreAtomPairsFP*.

    SetNormalizationMethodology
            $TopologicalPharmacophoreAtomPairsFP->SetNormalizationMethodology($Value);

        Sets normalization methodology to use for scaling the occurrence
        count of pharmacophore atom pairs within specified distance range
        and returns *TopologicalPharmacophoreAtomPairsFP*. Default value:
        *None*. Possible values: *None, ByHeavyAtomsCount or
        ByAtomTypesCount*.

    SetValuesPrecision
            $TopologicalPharmacophoreAtomPairsFP->SetValuesPrecision($Value);

        Sets precision of atom pairs count real values which might be
        generated after normalization or fuzzification and returns
        *TopologicalPharmacophoreAtomPairsFP*. Default: up to *2* decimal
        places.

    StringifyTopologicalPharmacophoreAtomPairsFingerprints
            $String = $TopologicalPharmacophoreAtomPairsFP->
                          StringifyTopologicalPharmacophoreAtomPairsFingerprints();

        Returns a string containing information about
        *TopologicalPharmacophoreAtomPairsFingerprints* object.

AUTHOR
    Manish Sud <[e-mail]>

SEE ALSO
    Fingerprints.pm, FingerprintsStringUtil.pm,
    AtomNeighborhoodsFingerprints.pm, AtomTypesFingerprints.pm,
    EStateIndiciesFingerprints.pm, ExtendedConnectivityFingerprints.pm,
    MACCSKeys.pm, PathLengthFingerprints.pm,
    TopologicalAtomPairsFingerprints.pm,
    TopologicalAtomTripletsFingerprints.pm,
    TopologicalAtomTorsionsFingerprints.pm,
    TopologicalPharmacophoreAtomTripletsFingerprints.pm

COPYRIGHT
    Copyright (C) 2015 Manish Sud. All rights reserved.

    This file is part of MayaChemTools.

    MayaChemTools is free software; you can redistribute it and/or modify it
    under the terms of the GNU Lesser General Public License as published by
    the Free Software Foundation; either version 3 of the License, or (at
    your option) any later version.