Answers to your questions:
1. Document database
2. Graph database
3. A true positive sample is one that has been correctly classified as positive according to its parameters
I am data engineer with 4 + years of industry experience. Expertise in following areas.
1. Data ingestion(Flume, Sqoop, Kafka, Spark Streaming, JMS)
2. Data Processing( Hive, SPark, Mapreduce)
3. Glue for ETL in aws.
4. AWS Emr, Redshift, Athena, Data Pipeline.
5. Sentiment anlaysis, text summarization adn recommendations engines.
I am a certified aws solutions architect as well. Looking forward to hearing from you.
Best Regards