Questions tagged [databases]

A comprehensive collection of related data organized for convenient access, generally associated with software to update and query the data.

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What would be the best data store for fast write/read of billions of float32s? SQLite? Hdf5? Other?

I am trying to create a library for sparse training. So it would need fast read/write of not only the machine learning model weights, but their optimizer momentum values as well. At the moment I would ...
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2answers
29 views

Null values as useful information for feature engineering

I'm preparing features for a neural network which I'll run in Keras and TensorFlow. The features are generated in Oracle. There I also replace null values. I'm not doing normalization on the database ...
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11 views

Any there databases with native support for applying a NN model to produce search rankings?

The Situation: I have a simple neural net with an input vector that consists of the euclidean distance between the attributes of two cars. (For example the attributes would include wheel size, car ...
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19 views

How to Model Real-World Historical Data Containing Temporal Periods

I have reached one of those points in research where I do not know enough about what I do not know to find possible solutions. I am working with a dataset containing information on federal judicial ...
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19 views

Best way to store and combine live data in visualization project

I am new to setting up databases beyond simple SQL and MongoDb, but have technical proficiency in programming and networking, primarily in Javascript. I am tasked with collecting data at multiple ...
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23 views

How best to find patterns in data that exhibit one-to-many and many-to-one relations?

I have a lot of log data related to alerts on a computer platform. Each log entry represents an alert, but several of the same alert can be fired for a single event over a span of time (either because ...
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20 views

System administration skills for data engineering [closed]

As a data scientist student, I will do an internship with a lot of data engineering tasks. It would be good if I had some initiation skills in sys-admins. This leads me to my questions: Why should ...
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1answer
30 views

ML model deployment architecture?

I came from a software development background and we have separate servers of the same database (dev, test, prod). The reason for this is because we develop our apps against the dev DB, run tests ...
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1answer
10 views

Text Dataset Help: Need to figure out how to get the publication date of a text

I am a highschool student working on a science fair project in which me and a friend plan to use a neural network for a classification problem. In this case the thing classified will be text and the ...
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3answers
76 views

Why are pandas/R/etc so common in a data scientist or analyst's workflow when one can resort to UDFs in an RDBMS?

It seems common for an analyst to have this workflow when using an RDBMS: use SQL to get a subset of data from the database, export it or use a connector, and then apply a data mining / model ...
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4answers
70 views

How should we manage large database

We currently manage a large volume of economic data in Excel in my organisation. All of the data is downloaded from different online databases into Excel spreadsheets (one for each data frequency ...
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1answer
64 views

Connect Orange 3.20 to postgresql database

I installed orange 3.20 on windows 7. It works so far, the problem is connecting it to a server based Postgres database. While the connection can be made in the moment, when you try to load a table ...
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1answer
69 views

What is the difference between ImageNet and ImageNet1k? How to download it?

Some papers mention just ImageNet and some papers mention ImageNet 1k database? What is the difference between these 2? Are they same or is the latter one subset of the former one? I'm working on ...
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1answer
36 views

How to find the values that never matched in a full join

Hello I have done this full join query: ...
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3answers
309 views

What is the ideal database that allows fast cosine distance?

I'm currently trying to store many feature vectors in a database so that, upon request, I can compare an incoming feature vector against many other (if not all) stored in the db. I would need to ...
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0answers
10 views

To what extent can one link data in a structured or rigorous way, given only partial knowledge base?

I seem to have stumbled on an interesting problem: suppose I am given partial information in two tables, say imports and exports between different countries, and I can query these, but e.g. the ...
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1answer
51 views

Machine Learning applied to database design [closed]

Is it possible to apply machine learning to database design given a data source with (pseudo) relationships?
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1answer
80 views

Will I be able to fetch a Data Analyst job if I learn everything in this image?

India Asking such a question because I am interested learn everything myself and I am confused about what to read. And I am interested by reading books, will that suffice? or should I compulsorily ...
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1answer
2k views

Replacing column values in pandas with specific column with multiple database operation?

Need to replace database of the column in specific refine query with multiple operations as mention in below image. Trying such operation as an individual, but can't understand which method to use can ...
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17 views

Database System for Manual Entry

I'm in charge of setting up a patient register (100K+ patients) for a non-profit project with little money. This register should provide the basis for later datascience. I'm not sure how a good ...
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0answers
23 views

Database for storing nested s3 objects from broom, sweep, or tidy in R

I'm working on a product that requires automated forecasting of time-series data in R & Shiny. Using R's sweep, broom, & tidy packages, I get these 'tibbles', which are like dataframes with ...
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2answers
60 views

Database on time to churn in telecomunication

I would like to research about time to churn1 in the telecommunication market. Does anyone have a link to such a database? The only ones I found did not include the time of churn, but only if a ...
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0answers
23 views

Local U.S. City Government Expenditures APIs?

I'm currently working on a project that will compile the various expenditures of local city governments (Health, Transportation, etc), what initiatives are present in those major cities, and more ...
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1answer
213 views

Trying to get Orange connected to Postgres Database

I recently came across Orange, and am very keen to try it for our company's purposes (around 20 potential users, perhaps more). I have installed Orange (latest version) and am trying to connect to our ...
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1answer
106 views

Big Data - Data Warehouse Solutions?

I have a dozen of databases that stores different data, and each of them are 100TBs in size. All of the data is stored in AWS services such as RDS, Aurora and Dynamo. Many times I find myself need to ...
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0answers
2k views

Not enough replicas available for query at consistency all (2 required but only 1 alive)

I have a Cassandra cluster of 2 nodes and a keyspace "test" with a replication factor of 2. The consistency level is All. I am running a spark job which dumps data in Cassandra database. So, the ...
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1answer
1k views

Is there an overview over recommender system architectures?

I want to learn more about the recommender system topic. I am very interested in the usage of different database systems for this use case. My problem is that I cannot find a good overview over ...
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1answer
398 views

Are there databases specializing in scientific data

I am currently comparing file formats (HDF5 , etc.) to DBMS systems for a scientific data repository. I know of proprietary solutions such as Oracle extensions, but are there open source/free systems ...
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0answers
499 views

2D Image-based Avatar Animation With Expressions / Image-To-Image Translation

What I want to do Input an image-sequence (videoframes) that is already cropped and aligned to only the face/hair region and photorealistically replace this Person, Person A (can be anyone, I also ...
2
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1answer
33 views

MS Access issue [closed]

I have a database that I send to an excel sheet that auto populates some field in a report with calculations that I need. There are several users and the excel sheet cannot be open at multiple times ...
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4answers
8k views

Advantages of pandas dataframe to regular relational database

In Data Science, many seem to be using pandas dataframes as the datastore. What are the features of pandas that make it a superior datastore compared to regular relational databases like MySQL, which ...
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3answers
7k views

Best practices to store Python machine learning models

What are the best practices to save, store, and share machine learning models? In Python, we generally store the binary representation of the model, using pickle or joblib. Models, in my case, can be ...
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2answers
113 views

Seeking advice on database architecture — given my problem, what tools should I learn?

I'm a fairly experienced R user, but until now I haven't had a good reason to learn to use databases. Now I have a problem where I am dealing with model output that I need to save to disk, and then ...
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1answer
22 views

How to document operations on a database? [closed]

I am working on a scientific article, where I am going to work with a large SQL based database. This work consist of everything from washing data, creating sub-databases etc. How can I document this ...
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2answers
849 views

Does SQL Server support the Poisson distribution?

I am trying to do some work that is primarily based in SQL Server. I cannot seem to find a native function to SQL that supports the Poisson distribution. Has anyone had success with applying Poisson ...
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1answer
83 views

Is there a term for “this month last year” in a report? [closed]

I'm building a report that has month over month data, but also "this month last year". Is there a better/standard way of describing this?
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3answers
1k views

Instead of one-hot encoding, can I store the same information in one column using a single value?

Rather than creating 15 additional columns full of sparse binary data, could I: 1) use the first 15 prime numbers as indexes for the 15 categories 2) store data by multiplying the prime numbers of ...
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2answers
5k views

Classified Enron Email Dataset

I'm building a system able to classify emails into different categories (positive, negative, out of office, etc...) and I'm looking for a dataset of already classified emails to avoid hand ...
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1answer
168 views

is there big difference between data Science , big Data and database? [closed]

is there big difference between data Science , big Data and database? i am confused in these three can anyone help me to out of this confusion?
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56 views

Analytics oriented database

I'm analyzing a single large table (about 50GB 16M rows, 15 columns perhaps more) currently using PostgreSQL 9.4. Most of my queries doesn't involve more tables. Queries run time are very large. I'm ...
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1answer
855 views

word2vec -storing a word and its vector yet be able to efficiently run k-nearest neighbour

After training a model using word2vec I'd now like to store the trained model with the word serving as a key and the vector as its value. However I'm not sure how I'll be able to implement in this way ...
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3answers
2k views

@RISK Vs R. Monte Carlo simulation in R?

Are there any cheaper or open source alternatives to @RISK or are there packages for R that would be able to perform the same tasks? http://www.palisade.com/risk/ @RISK (pronounced “at risk”) ...
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1answer
733 views

Implementing Frequently bought together using a DB

We have a classic structure of an online shop database (products, customers, sales) and we want to implement a Frequently bought together feature. Our software is in ASP.NET and we do not know PHP to ...
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1answer
561 views

Overcome memory limitation when downloading from database into Orange

I would like to run the association rule mining algorithm of the Orange library on a dataset that is stored in a PostgreSQL database. The table 'buildingset' contains the itemsets for each user, thus ...
2
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1answer
250 views

NoSQL vs SQL backend for semi structured data

I have a corpus of job descriptions and another corpus of CVs of applicants. I plan to implement a matching system using machine learning algorithms, to find top 5 or top 10 applicants for each job ...
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0answers
2k views

Decode SQLite database blobs: how to start?

Updated: see bottom of this question. Not sure if I am at the right channel here but I have good hopes someone here might be able to help me. I am trying to process and analyse data from a Footscan ...
2
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2answers
292 views

Data structure design for supporting arbitrary number of columns in table or database

I'm currently working on a sort-of a meta-modeler to build a free web service so that people can input data and run several models on that data. The task I'm currently struggling is: user needs to ...
23
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4answers
8k views

What makes columnar databases suitable for data science?

What are some of the advantages of columnar data-stores which make them more suitable for data science and analytics?
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1answer
49 views

Looking for a 'CITY, STATE' within a body of text (from a CITY-STATE database)

I'm looking for an optimal way to search a large body of text for a combination of words that resemble any CITY, STATE combination I have in a separate CITY-STATE database. My only idea would be to ...
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3answers
151 views

Can Hadoop be beneficial when data is in database tables and not in a file system

I work for a bank. Most of our data is in the form of database tables. Would we benefit by implementing Hadoop? I am of the impression that Hadoop is more for a Distributed File System (unstructured ...