Podcast
Questions and Answers
What is the function of the PrefixSpan algorithm?
What is the function of the PrefixSpan algorithm?
- To find the frequent events and generate projected databases (correct)
- To process the data in a breadth-first manner
- To focus on suffixes rather than prefixes
- To store a detailed version of the database
What do suffixes represent in the context of sequences?
What do suffixes represent in the context of sequences?
- The set of events at the beginning of a sequence
- The occurrence of the last event in the prefix at the same time as the first event in the suffix
- The first event in the sequence
- The rest of the elements in the sequence after the prefix (correct)
What does the notation (_) indicate in the context of prefixes and suffixes?
What does the notation (_) indicate in the context of prefixes and suffixes?
- It signifies the end of a sequence
- It shows the time relationship between the last event in the prefix and the first event in the suffix (correct)
- It indicates an error in the sequence
- It represents a prefix
How does PrefixSpan algorithm store a compact version of the database?
How does PrefixSpan algorithm store a compact version of the database?
What is considered in the projected database generated by PrefixSpan algorithm for each frequent event?
What is considered in the projected database generated by PrefixSpan algorithm for each frequent event?
In what manner does PrefixSpan algorithm process the data?
In what manner does PrefixSpan algorithm process the data?
What is the main issue with processing data streams?
What is the main issue with processing data streams?
What is the purpose of generating the projected databases for frequent events?
What is the purpose of generating the projected databases for frequent events?
Why is it not possible to perform multiple passes over data streams?
Why is it not possible to perform multiple passes over data streams?
What is a characteristic of stream mining algorithms?
What is a characteristic of stream mining algorithms?
What does the term 'projected database' refer to in this context?
What does the term 'projected database' refer to in this context?
Why do stream mining algorithms face memory limits?
Why do stream mining algorithms face memory limits?
What is a key issue with processing data streams in real-time?
What is a key issue with processing data streams in real-time?
Why is it necessary to re-design stream mining algorithms?
Why is it necessary to re-design stream mining algorithms?
What is meant by 'frequent events' in the context of stream data processing?
What is meant by 'frequent events' in the context of stream data processing?
What is one of the issues related to memory limits when processing stream data?
What is one of the issues related to memory limits when processing stream data?
What is the key similarity between the PrefixSpan algorithm and the FP-Growth algorithm?
What is the key similarity between the PrefixSpan algorithm and the FP-Growth algorithm?
What is the primary purpose of generating the projected database for each frequent event in the PrefixSpan algorithm?
What is the primary purpose of generating the projected database for each frequent event in the PrefixSpan algorithm?
What does the notation (_) indicate in the context of prefixes and suffixes?
What does the notation (_) indicate in the context of prefixes and suffixes?
Why does PrefixSpan algorithm generate a list of sequences having a certain event as a prefix?
Why does PrefixSpan algorithm generate a list of sequences having a certain event as a prefix?
What is assumed about the order of events within an element in the context of prefixes and suffixes?
What is assumed about the order of events within an element in the context of prefixes and suffixes?
What does a prefix represent in relation to a sequence?
What does a prefix represent in relation to a sequence?
In the context of stream data processing, what is the main challenge related to memory limits?
In the context of stream data processing, what is the main challenge related to memory limits?
What is the primary reason for the re-design of stream mining algorithms?
What is the primary reason for the re-design of stream mining algorithms?
In the context of stream data processing, what does the term 'projected database' refer to?
In the context of stream data processing, what does the term 'projected database' refer to?
What characteristic is typical of stream mining algorithms?
What characteristic is typical of stream mining algorithms?
Why is it not feasible to perform multiple passes over data streams?
Why is it not feasible to perform multiple passes over data streams?
What is considered in the projected database generated by PrefixSpan algorithm for each frequent event?
What is considered in the projected database generated by PrefixSpan algorithm for each frequent event?
'Frequent events' in the context of stream data processing refer to events that:
'Frequent events' in the context of stream data processing refer to events that:
What is one of the key issues with processing data streams in real-time?
What is one of the key issues with processing data streams in real-time?
What does 'frequent' indicate in the context of stream data processing?
What does 'frequent' indicate in the context of stream data processing?
What is meant by 'suffixes' in the context of sequences?
What is meant by 'suffixes' in the context of sequences?
