Question 1 Decision Trees Using the following dataset: y z Class F A T A F F T B T F A F F в T F B F A What is the entropy of the entire dataset? Hint: Which proportion of the data is class A? class B? Hint 2: Then entropy: I = –Pa log2 PA – PB log2 PB log z Hint 3: If your calculator can't directly do log base-2, remember log, x = log 2

Question 1 Decision Trees Using the following dataset: y z Class F A T A F F T B T F A F F в T F B F A What is the entropy of the entire dataset? Hint: Which proportion of the data is class A? class B? Hint 2: Then entropy: I = –Pa log2 PA – PB log2 PB log z Hint 3: If your calculator can't directly do log base-2, remember log, x = log 2

Database System Concepts

7th Edition

ISBN:9780078022159

Author:Abraham Silberschatz Professor, Henry F. Korth, S. Sudarshan

Publisher:Abraham Silberschatz Professor, Henry F. Korth, S. Sudarshan

Chapter1: Introduction

Section: Chapter Questions

Problem 1PE

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Write a program that animates quadratic probing,as shown in Figure . You can change the initial size of the hash-table in theprogram. Assume the load-factor threshold to be 0.8.
Assume we wish to resize an existing hash table because the current hash table is becoming too small for the application. Without writing code briefly describe the process of resizing a hash table by "copying" the old data to the new hash table. What is the expected complexity of your process using Big-O notation. Justify your complexity measure. An example of a hash table before resizing is given.
Select all qualities of a very well formatted answer:
2770 def difference(self, source): 278 279 A280 Efficiency: 281 Return a set that contains the items that only exist in self and not in source. 282 283 Maximum size of target Set is the maximum size of self. Use: target = self.difference(source) 284 285 286 287 Parameters: 288 source - a set (Set) 289 Returns: - a set containing one copy of all the values target in self that are not in source (Set) 290 291 292 Examples: (1,2,3) difference (3,2,1) is () (1,2,3) difference (4,5,6) is (1,2,3) (1,2,3,4,5,6) difference (0,2,4,6,8) is (1,3,5) 293 294 295 296 297 298 299 300 # your code here
Implement c# program to Retrieving a value using its associated key can be accomplished using an indexer, which works just like an indexer for an array. A key is passed in as the index value, and the value associated with the key is returned, unless the key doesn’t exist, in which a null is returned. you can use an indexer along with the Keys method to retrieve all the data stored in a hash table
In $12.2 Lamport's Hash we mentioned the notion of using only 64 bits of the hash. At each stage, 128 bits are computed, 64 bits are thrown away, and the hash of the retained 64 bits is used in the next stage. The purpose of only using 64 bits is so that a human does not need to type as long a string. Assuming the person will still only type 64 bits, does it work if hash" does a hash of all 128 bits of hash"-1, but what the person actually transmits is 64 bits of the result?
Please code with Python(.py)--> Explanation: I have attached the Explanation picture as well.
blockchain is a collection ofrecords (called blocks), where each block links to the previous block using cryptography. Eachblock contains cryptographic hash, timestamp and data relevant to its application. Think ofit as a distributed ledger where instead of information being stored in a database it is storedon the blockchain. Some examples of solutions that use a blockchain at its core are:1. Cryptocurrencies (however, for this project you may NOT do a cryptocurrency)2. Smart contracts3. Trading4. Supply chain management5. Anti-counterfeiting6. Healthcare7. Domain names8. Proof of existence9. Voting10. and many others! Programming Language: Java The use of third-party libraries for primary functionally is strictly prohibited, however, third party libraries can be used for other functionality such as communications and visualisation (such as normal JavaFX, JFreeChart, GraphStream, JGraphT, Yworks, JUNG or JMonkey). The use of other data structures for auxiliary operations is…
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>>> seqs = readFastaFile('mystery1.fa') >>> len(seqs) 27 >>> long_seqs = [] >>> for seq in seqs: ... print(seq.name, len(seq), len(seq.alphabet)) ... if len(seq) > 250: ... long_seqs.append(seq) Q9H9L7 192 20 P41223 144 20 Q13352 177 20 ... >>> writeFastaFile('mystery1_long.fa', long_seqs) List the 'special' methods from the sequence class in the first field. Just enter the method name for each, for example, for `__len__(self)` you would enter `__len__`. In the second, provide an example of each function's use using text, not code.