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The methods to score

Discuss about the Society for Industrial and Applied Mathematics.

The chosen articles demonstrate the way in which the MDL principles are applied successfully. Particularly, the pattern-based models are induced and designed through various means of compression. It has lead to characteristic and succinct descriptions of needed data. Nikolaj and Jilles argued that the conventional pattern mining activities has been asking the wring question. Apart from asking every pattern to be satisfying some of the interestingness calculations, the business must seek non-redundant and effective pattern sets. This must allow avoiding pattern explosion.  As rooted strongly in the theory of algorithmic information, the approach discussed in their articles revealed that the best set of patterns has been the set that has been compressing the best data.  Jaroslav Fowkes and Charles Sutton have formalized the problems through MDL or Minimum Depth Length principle. They has described the useful model classes. Further, they have demonstrated the algorithmic approaches inducing good models from the retrieved data. Lastly, the authors has described how theses obtained models, apart from, showing the primary data patterns are used for an extensive range of tasks of data mining. Thus they have showed that the MDL has selected the helpful patterns.

Apratim and Jilles have showed that finding the primary structure of the database has been one of the primary aims of data mining. Under pattern set mining, the authors have done that by finding the small set of patterns describing the data efficiently. Richer the class of patterns considered and more powerful the description language has been, the better is to summarize the overall data. They have suggested SQUISH, method to summarize those sequential data through rich set of patterns. This has been helpful to interleave. Investigations done in the article has shown that SQUISH has been quicker than the state of art. It has resulted in better models and discovered the meaningful semantics. These are in the form of patterns identifying various choices of values.

However, there has been a rising problems how to score. Since, the mining set of patterns has together describing the data that has been solved effectively the pattern explosion. The challenges in computing those correlation score of the frequent patterns has been during the mining step of PrefixSpan. This has been due it is unknown that probability of the sub-patterns are still unknown. Here, the naïve solution has to generate every frequent pattern. Then create the in-memory index of those patterns and re-examining every frequent pattern through calculating the scores of correlation. The steps are demonstrated below.

  1. The missing useful patterns has been needed to avoided having the minimum support that is commonly set low and the in-memory index of frequent patterns might exceeds the availability of the main memory as the result.
  2. Though the in-memory index of the frequent patterns are not been created, the ability of the patterns of the mining algorithm has been highly depending in effectively of the hash function of indexes. This indicates the cost of access one single value. It has been particularly on the basis of the patterns themselves has been varying structures and formats.
  3. Since, the algorithms has been disk-based, it has been easy to develop the effectively the usage of parallel computing.

Ways to mine those sets

The various ways to mine the data sets. The SQS-CANDIDATES algorithm has needed collection of candidate patterns that is needed to be materialized. This in practice has been very much challenging. The popular pattern explosions have been preventing patterns that are needed to be mined at the intended low thresholds. Here an alternative strategy is needed to be proposed to find out the good code tables from the data. Apart from filtering the pre-minded set, the experts has discovered candidates on fly and considered the patterns that are needed to be optimized the score provided to the present alignment.

For example the “Apriori” like algorithms can be considered. Further, let there be a transaction of database that has been involving customer sequences. Here, the database has been composed of three attributes like purchased-item, transaction time and customer-id. Here the mining process is decomposed five steps.

  • Sort Step: here the transactional database is sorted as the per the customer id.
  • L-itemset step: Here, the objective has been the retrieve item sets from the sorted databases. This has been on the basis of support threshold.
  • Transformation step: It has needed to be replaced by various sequences through those huge item sets that are needed to be contained. As far as efficient mining is considered, every large item sets are been mapped under an integer series. At last, the real database is been transformed to set of various customer sequences that is represented by those huge item sets.
  • Sequence step: This has been from the transformed sequential database. The step has been generating every sequential pattern.
  • Maximal step: The step has been pruning sequential patterns within the patterns that are super sequential. This is because they are only concerned with large number of sequential patterns.

Thus the provided articles have shown that we are in the age of data and require tools for discovering valuable data within huge quantities of data. Here the aim of the exploratory data mining has been supply more insights within the given data as possible. Under the field, pattern set mining has aiming to reveal structure in the form of sets of various patterns. Though the pattern set mining has been showing effective solution for infamous pattern explosion, it has been vital to challenge that has been remaining.

However, one the primary problems identified has been to create the principles methods allowing users and task-specific data that is considered. This has been involving the user directly under the process of discovery. Thus, the resulting patterns have been more interesting and relevant to users. For achieving that, the algorithms of pattern mining has been needed to be assimilated to the techniques that must from human-computer interaction and visualization. On the other hand, another challenge has been to establish the techniques performing the well contained resources as the current methods has been commonly computationally intensive. As a result, there has been only applied for relatively smaller datasets over fast computers. Here, the ultimate aim has been to make pattern mining more useful practically. This is through enabling users to interactively explore those data and then determine the interesting structure. In this way the articles has demonstrated the “state-of-the-art”, outlined various promising future directions and discussed different open problems.

The SQUISH has been one of the richer languages obtained though much better rates of compression with very few patterns. In order to find the good models SQUISH has been highly effective and versatile search algorithm. Apratim and Jilles highlighted that the efficiency of the SQUISH has been stemming from reuse of data that has been partitioning of data and specifically considering the presently relevant occurrences of various patterns of data. This has been a realistic “any-time” algorithm. This can be run from any-time budget that has been the opportunity. Here, extensive experimental assessment has indicated that SQUISH has been performing very effectively in practice. This has been much better to retrieve the interleaving patterns than various current proposed solutions. Here, the choice-patterns discovered have been providing the insights within the data beyond the state of art. This can be identified semantically with coherent patterns. Further, it is also seen that SQUISH has been highly extendable and allowing richer classes of patterns that is needed to be considered in future.

How can SQUISH be faster

SQUISH can be made faster through minimizing the drawbacks of the algorithm. This has included the more accurate heuristic to estimate the error points of the queue. Here, the local estimation of every priority has been the remaining point under the buffer that has been incapable to handle huge compression rates. To raise the speed of SQUISJ with 10% or more original points, it has indicated that they be used as the preprocessing algorithm has far as aggressive compression is considered. Here, various experimental results are needed for validating whether SQUISH has been effective as the preprocessing algorithm.  Further, extra recommendations for further work have included the determination of effectiveness of compression under common spatial applications. This has included modeling fo traffic flow, determination of congestion bottlenecks, identifying the speeding of various hot-spots of violation.

The authors have identified various databases of different event sequences and at the set of various sequential patterns that describes the data best. SQs have been describing the databases with occurrence of various patterns. SQs have needed the occurrences to be disjoint. However, the patterns allowed for interleaving. It has lead to more succinct description and better call of patterns. Further richer classes of patterns are used here to reduce the passage of data. Thus the gaps are not allowed for various gaps under various occurrences and has been allowing for emitting one of multiple events at a specific location. For instance, the article has introduced statistically well-founded method regarding succinctly that has been summarizing those sequences. These are formalized to encode the sequence datasets provided with MDL identify at the best set as the set has been describing the data in most succinct manner. In order to optimize the score, effective heuristic for determining patterns has been best describing the part of the data. In order to seek good models the SGS-CANDIDATES and SQS-SEARCH are introduced. The former one has been filtering any specific candidate collection.

The SQS-SEARCH is the “parameter-free” algorithm that has been efficiently mining that model from the data directly. Various experiments in various real and synthetic data have been showing SQS effectively. They have been discovering models of high-quality summarizing the overall data. Thus they have been correctly identifying those primary patterns. Here the number of patterns returned has been small and up to some hundred. Further, most importantly, the returned model has been not showing the redundancy and none of those patterns are been polluted by unrelated and frequent models. Thus overall, the short and long terms of the SQL have been mining smaller sets of vital, non-redundant and various serial episodes together succinctly describing the information at hand.

The articles show that MDL or Minimum Description Length Principle has been the practical version of the innovative Kolmogorov Complexity. However, the MDL has possessed a stronger theoretical foundation it is unable to compute except for few particular cases. It can be noted the MDL has been needing compression to get lost for allowing fair comparison between various M ∈ M. The models considered are simple code tables. The code table has been needed to be looked-up as the dictionary or look-up table between various patterns and related codes. The code table has consisted of four columns, where the first column has been containing patterns and the seconds has been consisting of codes to identify those patterns. Further, the two right-most columns has been containing pattern-dependent codes in order to determine gaps and absence contained under the embedding of such pattern.

The ISM algorithm has been lying on the basis of generative probabilistic model of sequence database and using EM for searching for that various set of patterns. This has been most likely generating database. It has been not been explicitly considering the model complexity. Similar to SQUISH, the ISM is able to control nesting and interleaving of various sequences. These are empirically compared to various ISMs under experiments.

In order to summarize that sequence of events, SQs algorithm has suggested SQs algorithm. The MDL is used here and for defining scores and proposing algorithms for scoring the data and discovering effective patterns setting directly from the data. A related and different probabilistic approach is undertaken for directly punishing those gaps. This has not allowed the patterns to interleave. Thus the article demonstrates how SQUISH has been able to find out interleaving and various nested patterns along with considering the richer class of patterns than ISM and SQS.

Kalofolias et al. has suggested various subgroup discoveries. Here the control variable is additionally considered. The technical solution is needed to be ignored. The focus is to be given on general problem where the control variable has been discrete valued to continuous valued. Song et al.  and Boley et al. creates a stronger method to justify the case.

For this the generative modeling is considered. The common context where SD is applicable is the place where one witnesses set of various data points belonging to specific domain and the activity is to extract the data from the information. This information is adopted to develop the performance of various corresponding algorithmic calculations. Thus it is intended that the subgroups as the representation of the knowledge obtained that must generalize the future data seen under the similar domain.

Here, two problems that are needed to be denoted are generalizing the future data. At first, class distribution is needed to be measured on smaller samples. Thus it is a poor estimate of the real distribution for the future. Next it has not been certain that whether the real distribution of subgroup has been distinct from entire distribution. Then to capture those aspects a generative model is employed to create a new test of the subgroup. Here the subgroup language used here has been the conjunctive normal form. This has been the disjunctions between various values over the similar feature. Here, every features treated has been nominal. As the original feature has been numerical in nature and containing more than 100 values, this has been discretised under 16 bits. Like for most of the data sets in the experiment an exhaustive search has been done.

The generative model has been used to assume that the data has been developed through a specific distribution that has been defined through various parameters like Gaussian distribution or any non-parametric variant. It has been providing the ability to generate data other than just discriminate it. For instance, a good example of generative modeling can be provided with Variational Auto Encoder. In this way the model can create data as it get trained, through a specific finite data-set. Moreover, there has been various algorithms that has been still possessing open directions for further compared to get supervised counterparts.

The clustering of social information has been big issue as both relations and attributes has been present. Various approaches have been there that are on common used for ignoring every aspect of data to other. The relation-only algorithm has been limited typically since it has the sparseness of various relations under the social media information, making strong patterns difficult. These feature only algorithms has been comprised the limitation that has possessed the most useful and interesting aspect of social information that has been the set of relations between various objects. Currently there has been sure in interest for considering the relations and features within the operation of clustering algorithm. Further, there have been approaches that have been based on that generative model. This has been corresponding to the hypothesis that the data has been present as the part of few unobserved distribution of probability.

The approaches of generative model discussed in the articles have been showing goof initial outcomes. As these are discussed, the broader terms are demonstrated that has been accomplished to provide the generative models. This has showed wjhat the open problems have been and hw those developing of generative models for relational data has been contribution of the field of social information processing. Thus the use of generative model has been discussed in order to cluster the social information. This approach has been allowing careful control of analysis and criteria. It has resulted in some current generative models that have been encouraging and interesting for future research at this area. Here, there have been various problems and the solution to that has been resulting in effective development under social information processing. The clustering of heterogeneous objects has been reducing the quantity of post-processing that has been needed as various types objects has been needed to be clustered in a separate manner. Further, the proper controlling of relation dependence has been needed to be found out that must beneficially harness the data that has been found in the latent dependencies under the data set.

Though there has been early success to design the generative models in order cluster. However there have been various problems remaining. The first one has been the diversity of the relational data. Here, the traditional clustering algorithm has been making assumptions that the data has been entirely independent and distributed independently. It has indicates that every object has been some similar kind and there has been no relation seen that has been present between those objects. Under the relational data set, the independence has been made no more for various objects in set. Moreover, there have been various relational data sets within various kinds of objects. Here the intuitive comparison has been not readily available. Further, an open problem has been specifically vital for processing the community of social information. It has been helpful to handle the temporal type of different social information. Further, various data sources like business networking graphs and friendship graphs has been evolving in due time. Here the individuals and communication links has been appearing and again disappearing on due time.

Moreover, maximum of the research has been focusing on considering sample of data from specific point in time for the analysis. Hence, it has been helpful to see how those relations has been changing in due time for evaluating the relative importance of relation between many people. At last it can be said that the algorithms are been needed to be developed as per as money and time has been considered. This has also included the discrete methods that are needed to be created for processing huge social information sets of data. In this way the entire clustering of the information has been the common task that has been helpful in several ways. Here, further, progress has been developing the generative models. This must result in finding the helpful clustering numerous social information sets of data.


Bhattacharyya, A. and Vreeken, J., 2017, June. Efficiently summarising event sequences with rich interleaving patterns. In Proceedings of the 2017 SIAM International Conference on Data Mining (pp. 795-803). Society for Industrial and Applied Mathematics.

Boley, M., Goldsmith, B.R., Ghiringhelli, L.M. and Vreeken, J., 2017. Identifying consistent statements about numerical data with dispersion-corrected subgroup discovery. Data Mining and Knowledge Discovery, 31(5), pp.1391-1418.

Fowkes, J. and Sutton, C., 2016, August. A subsequence interleaving model for sequential pattern mining. In Proceedings of the 22nd ACM SIGKDD International Conference on Knowledge Discovery and Data Mining (pp. 835-844). ACM.

Kalofolias, J., Boley, M. and Vreeken, J., 2017. Efficiently Discovering Locally Exceptional yet Globally Representative Subgroups. arXiv preprint arXiv:1709.07941.

Mampaey, M., Tatti, N. and Vreeken, J., 2011, August. Tell me what i need to know: succinctly summarizing data with itemsets. In Proceedings of the 17th ACM SIGKDD international conference on Knowledge discovery and data mining (pp. 573-581). ACM.

Song, H., Kull, M., Flach, P. and Kalogridis, G., 2016, September. Subgroup discovery with proper scoring rules. In Joint European Conference on Machine Learning and Knowledge Discovery in Databases (pp. 492-510). Springer, Cham.

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