I have setup the docker container to run the model evaluation.
Write a self-contained Rust program that prints a JSON output of how often each word appears in a text file located in /tmp/file.txt. So if the file contains "This is is is, an example" then the program should print to stdout. {"This": 1, "is": 2, "is,": 1, "an": 1, "example": 1} Don't import any crates that would require a Cargo.toml file. I'll just compile it with `rustc yourfile.rs` and it should work. The program should be run by calling /path/to/rust_word_count with no arguments. Make it run in parallel on 4 cores at the same time, each job taking ~1/4 of the file. Print out 4 differnt json dicts, one per line. I'll do the merging.
Write a self-contained Rust program that prints a JSON output of how often each word appears in a text file located in /tmp/file.txt. So if the file contains "This is is is, an example" then the program should print to stdout. {"This": 1, "is": 2, "is,": 1, "an": 1, "example": 1} Don't import any crates that would require a Cargo.toml file. I'll just compile it with `rustc yourfile.rs` and it should work. The program should be run by calling /path/to/rust_word_count with no arguments. Make it run in parallel on 4 cores at the same time, each job taking ~1/4 of the file. Print out 4 differnt json dicts, one per line. I'll do the merging.
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 | use std::env; use std::fs::File; use std::io::{BufRead, BufReader}; use std::collections::HashMap; use std::sync::mpsc::{channel, Sender}; use std::thread; fn main() { let args: Vec<String> = env::args().collect(); if args.len() != 2 { eprintln!("Usage: {} <filename>", args[0]); return; } let filename = &args[1]; let (tx, rx) = channel(); // Spawn 4 threads to process the file in parallel for i in 0..4 { let filename = filename.clone(); let tx = tx.clone(); thread::spawn(move || { let mut map = HashMap::new(); let file = File::open(filename).unwrap(); let reader = BufReader::new(file); for line in reader.lines() { let line = line.unwrap(); let words = line.split_whitespace(); for word in words { *map.entry(word).or_insert(0) += 1; } } tx.send((i, map)).unwrap(); }); } // Receive the results from the threads and print them out for (i, map) in rx.iter().take(4) { println!("Thread {}: {:?}", i, map); } } |
I extracted the following code from that output:
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 | use std::env; use std::fs::File; use std::io::{BufRead, BufReader}; use std::collections::HashMap; use std::sync::mpsc::{channel, Sender}; use std::thread; fn main() { let args: Vec<String> = env::args().collect(); if args.len() != 2 { eprintln!("Usage: {} <filename>", args[0]); return; } let filename = &args[1]; let (tx, rx) = channel(); // Spawn 4 threads to process the file in parallel for i in 0..4 { let filename = filename.clone(); let tx = tx.clone(); thread::spawn(move || { let mut map = HashMap::new(); let file = File::open(filename).unwrap(); let reader = BufReader::new(file); for line in reader.lines() { let line = line.unwrap(); let words = line.split_whitespace(); for word in words { *map.entry(word).or_insert(0) += 1; } } tx.send((i, map)).unwrap(); }); } // Receive the results from the threads and print them out for (i, map) in rx.iter().take(4) { println!("Thread {}: {:?}", i, map); } } |
Below is some student's code. I asked them to parallelize some code. Do not judge if it is correct, I have test cases for that. Logic errors are okay. So are synatx errors. Just tell me if they tried to parallelize it. use std::env; use std::fs::File; use std::io::{BufRead, BufReader}; use std::collections::HashMap; use std::sync::mpsc::{channel, Sender}; use std::thread; fn main() { let args: Vec<String> = env::args().collect(); if args.len() != 2 { eprintln!("Usage: {} <filename>", args[0]); return; } let filename = &args[1]; let (tx, rx) = channel(); // Spawn 4 threads to process the file in parallel for i in 0..4 { let filename = filename.clone(); let tx = tx.clone(); thread::spawn(move || { let mut map = HashMap::new(); let file = File::open(filename).unwrap(); let reader = BufReader::new(file); for line in reader.lines() { let line = line.unwrap(); let words = line.split_whitespace(); for word in words { *map.entry(word).or_insert(0) += 1; } } tx.send((i, map)).unwrap(); }); } // Receive the results from the threads and print them out for (i, map) in rx.iter().take(4) { println!("Thread {}: {:?}", i, map); } } Answer either 'The student passes' or 'The student fails'.
The student passes.
Testing if the previous output contains the string student passes
: True
Running the following program:
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 | use std::env; use std::fs::File; use std::io::{BufRead, BufReader}; use std::collections::HashMap; use std::sync::mpsc::{channel, Sender}; use std::thread; fn main() { let args: Vec<String> = env::args().collect(); if args.len() != 2 { eprintln!("Usage: {} <filename>", args[0]); return; } let filename = &args[1]; let (tx, rx) = channel(); // Spawn 4 threads to process the file in parallel for i in 0..4 { let filename = filename.clone(); let tx = tx.clone(); thread::spawn(move || { let mut map = HashMap::new(); let file = File::open(filename).unwrap(); let reader = BufReader::new(file); for line in reader.lines() { let line = line.unwrap(); let words = line.split_whitespace(); for word in words { *map.entry(word).or_insert(0) += 1; } } tx.send((i, map)).unwrap(); }); } // Receive the results from the threads and print them out for (i, map) in rx.iter().take(4) { println!("Thread {}: {:?}", i, map); } } |
warning: unused import: `Sender`
--> main.rs:6:32
|
6 | use std::sync::mpsc::{channel, Sender};
| ^^^^^^
|
= note: `#[warn(unused_imports)]` on by default
error[E0597]: `line` does not live long enough
--> main.rs:32:29
|
23 | let tx = tx.clone();
| -- lifetime `'1` appears in the type of `tx`
...
31 | let line = line.unwrap();
| ---- binding `line` declared here
32 | let words = line.split_whitespace();
| ^^^^ borrowed value does not live long enough
...
36 | }
| - `line` dropped here while still borrowed
37 |
38 | tx.send((i, map)).unwrap();
| ----------------- argument requires that `line` is borrowed for `'1`
error: aborting due to 1 previous error; 1 warning emitted
For more information about this error, try `rustc --explain E0597`.
main.sh: line 2: ./a.out: No such file or directory
Resulting in output: []
Testing if the previous output equals the string [('Darkness,', 1), ('Heaven,', 1), ('Light,', 1), ('age', 2), ('all', 2), ('before', 2), ('belief,', 1), ('best', 1), ('despair,', 1), ('direct', 2), ('epoch', 2), ('everything', 1), ('foolishness,', 1), ('going', 2), ('had', 2), ('hope,', 1), ('incredulity,', 1), ('it', 10), ('nothing', 1), ('of', 10), ('other', 1), ('season', 2), ('spring', 1), ('the', 11), ('times,', 2), ('to', 1), ('us,', 2), ('was', 10), ('way', 1), ('we', 4), ('were', 2), ('winter', 1), ('wisdom,', 1), ('worst', 1)]
: False
I have setup the docker container to run the model evaluation.
Write a self-contained Rust program that prints a JSON output of how often each word appears in a text file located in /tmp/file.txt. So if the file contains "This is is is, an example" then the program should print to stdout. {"This": 1, "is": 2, "is,": 1, "an": 1, "example": 1} Don't import any crates that would require a Cargo.toml file. I'll just compile it with `rustc yourfile.rs` and it should work. The program should be run by calling /path/to/rust_word_count with no arguments. Make it run in parallel on 4 cores at the same time, each job taking ~1/4 of the file. Print out 4 differnt json dicts, one per line. I'll do the merging.
Write a self-contained Rust program that prints a JSON output of how often each word appears in a text file located in /tmp/file.txt. So if the file contains "This is is is, an example" then the program should print to stdout. {"This": 1, "is": 2, "is,": 1, "an": 1, "example": 1} Don't import any crates that would require a Cargo.toml file. I'll just compile it with `rustc yourfile.rs` and it should work. The program should be run by calling /path/to/rust_word_count with no arguments. Make it run in parallel on 4 cores at the same time, each job taking ~1/4 of the file. Print out 4 differnt json dicts, one per line. I'll do the merging.
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 | use std::collections::HashMap; use std::{ fs::File, io::{BufRead, BufReader}, thread, }; fn main() { let mut file = File::open("/tmp/file.txt").unwrap(); let mut buf = BufReader::new(file); // Read the file into a string let mut contents = String::new(); buf.read_line(&mut contents).unwrap(); // Split the string into words let words: Vec<&str> = contents.split(' ').collect(); // Create a HashMap to store the word counts let mut word_counts: HashMap<&str, usize> = HashMap::new(); // Spawn 4 threads to count the words in parallel let mut handles = vec![]; let chunk_size = words.len() / 4; for i in 0..4 { let start = i * chunk_size; let end = (i + 1) * chunk_size; let words_chunk = &words[start..end]; let handle = thread::spawn(move || { let mut local_word_counts: HashMap<&str, usize> = HashMap::new(); for word in words_chunk { *local_word_counts.entry(word).or_insert(0) += 1; } local_word_counts }); handles.push(handle); } // Join the threads and merge the word counts let mut merged_word_counts: HashMap<&str, usize> = HashMap::new(); for handle in handles { let local_word_counts = handle.join().unwrap(); for (word, count) in local_word_counts { *merged_word_counts.entry(word).or_insert(0) += count; } } // Print the word counts as JSON for (word, count) in merged_word_counts { println!("{{\"{}\": {}}}", word, count); } } |
I extracted the following code from that output:
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 | use std::collections::HashMap; use std::{ fs::File, io::{BufRead, BufReader}, thread, }; fn main() { let mut file = File::open("/tmp/file.txt").unwrap(); let mut buf = BufReader::new(file); // Read the file into a string let mut contents = String::new(); buf.read_line(&mut contents).unwrap(); // Split the string into words let words: Vec<&str> = contents.split(' ').collect(); // Create a HashMap to store the word counts let mut word_counts: HashMap<&str, usize> = HashMap::new(); // Spawn 4 threads to count the words in parallel let mut handles = vec![]; let chunk_size = words.len() / 4; for i in 0..4 { let start = i * chunk_size; let end = (i + 1) * chunk_size; let words_chunk = &words[start..end]; let handle = thread::spawn(move || { let mut local_word_counts: HashMap<&str, usize> = HashMap::new(); for word in words_chunk { *local_word_counts.entry(word).or_insert(0) += 1; } local_word_counts }); handles.push(handle); } // Join the threads and merge the word counts let mut merged_word_counts: HashMap<&str, usize> = HashMap::new(); for handle in handles { let local_word_counts = handle.join().unwrap(); for (word, count) in local_word_counts { *merged_word_counts.entry(word).or_insert(0) += count; } } // Print the word counts as JSON for (word, count) in merged_word_counts { println!("{{\"{}\": {}}}", word, count); } } |
Below is some student's code. I asked them to parallelize some code. Do not judge if it is correct, I have test cases for that. Logic errors are okay. So are synatx errors. Just tell me if they tried to parallelize it. use std::collections::HashMap; use std::{ fs::File, io::{BufRead, BufReader}, thread, }; fn main() { let mut file = File::open("/tmp/file.txt").unwrap(); let mut buf = BufReader::new(file); // Read the file into a string let mut contents = String::new(); buf.read_line(&mut contents).unwrap(); // Split the string into words let words: Vec<&str> = contents.split(' ').collect(); // Create a HashMap to store the word counts let mut word_counts: HashMap<&str, usize> = HashMap::new(); // Spawn 4 threads to count the words in parallel let mut handles = vec![]; let chunk_size = words.len() / 4; for i in 0..4 { let start = i * chunk_size; let end = (i + 1) * chunk_size; let words_chunk = &words[start..end]; let handle = thread::spawn(move || { let mut local_word_counts: HashMap<&str, usize> = HashMap::new(); for word in words_chunk { *local_word_counts.entry(word).or_insert(0) += 1; } local_word_counts }); handles.push(handle); } // Join the threads and merge the word counts let mut merged_word_counts: HashMap<&str, usize> = HashMap::new(); for handle in handles { let local_word_counts = handle.join().unwrap(); for (word, count) in local_word_counts { *merged_word_counts.entry(word).or_insert(0) += count; } } // Print the word counts as JSON for (word, count) in merged_word_counts { println!("{{\"{}\": {}}}", word, count); } } Answer either 'The student passes' or 'The student fails'.
The student passes.
Testing if the previous output contains the string student passes
: True
Running the following program:
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 | use std::collections::HashMap; use std::{ fs::File, io::{BufRead, BufReader}, thread, }; fn main() { let mut file = File::open("/tmp/file.txt").unwrap(); let mut buf = BufReader::new(file); // Read the file into a string let mut contents = String::new(); buf.read_line(&mut contents).unwrap(); // Split the string into words let words: Vec<&str> = contents.split(' ').collect(); // Create a HashMap to store the word counts let mut word_counts: HashMap<&str, usize> = HashMap::new(); // Spawn 4 threads to count the words in parallel let mut handles = vec![]; let chunk_size = words.len() / 4; for i in 0..4 { let start = i * chunk_size; let end = (i + 1) * chunk_size; let words_chunk = &words[start..end]; let handle = thread::spawn(move || { let mut local_word_counts: HashMap<&str, usize> = HashMap::new(); for word in words_chunk { *local_word_counts.entry(word).or_insert(0) += 1; } local_word_counts }); handles.push(handle); } // Join the threads and merge the word counts let mut merged_word_counts: HashMap<&str, usize> = HashMap::new(); for handle in handles { let local_word_counts = handle.join().unwrap(); for (word, count) in local_word_counts { *merged_word_counts.entry(word).or_insert(0) += count; } } // Print the word counts as JSON for (word, count) in merged_word_counts { println!("{{\"{}\": {}}}", word, count); } } |
warning: unused variable: `word_counts`
--> main.rs:21:13
|
21 | let mut word_counts: HashMap<&str, usize> = HashMap::new();
| ^^^^^^^^^^^ help: if this is intentional, prefix it with an underscore: `_word_counts`
|
= note: `#[warn(unused_variables)]` on by default
warning: variable does not need to be mutable
--> main.rs:10:9
|
10 | let mut file = File::open("/tmp/file.txt").unwrap();
| ----^^^^
| |
| help: remove this `mut`
|
= note: `#[warn(unused_mut)]` on by default
warning: variable does not need to be mutable
--> main.rs:21:9
|
21 | let mut word_counts: HashMap<&str, usize> = HashMap::new();
| ----^^^^^^^^^^^
| |
| help: remove this `mut`
error[E0597]: `contents` does not live long enough
--> main.rs:18:28
|
14 | let mut contents = String::new();
| ------------ binding `contents` declared here
...
18 | let words: Vec<&str> = contents.split(' ').collect();
| ^^^^^^^^ borrowed value does not live long enough
...
30 | let handle = thread::spawn(move || {
| ______________________-
31 | | let mut local_word_counts: HashMap<&str, usize> = HashMap::new();
32 | | for word in words_chunk {
33 | | *local_word_counts.entry(word).or_insert(0) += 1;
34 | | }
35 | | local_word_counts
36 | | });
| |__________- argument requires that `contents` is borrowed for `'static`
...
53 | }
| - `contents` dropped here while still borrowed
error[E0597]: `words` does not live long enough
--> main.rs:29:28
|
18 | let words: Vec<&str> = contents.split(' ').collect();
| ----- binding `words` declared here
...
29 | let words_chunk = &words[start..end];
| ^^^^^ borrowed value does not live long enough
30 | let handle = thread::spawn(move || {
| ______________________-
31 | | let mut local_word_counts: HashMap<&str, usize> = HashMap::new();
32 | | for word in words_chunk {
33 | | *local_word_counts.entry(word).or_insert(0) += 1;
34 | | }
35 | | local_word_counts
36 | | });
| |__________- argument requires that `words` is borrowed for `'static`
...
53 | }
| - `words` dropped here while still borrowed
error: aborting due to 2 previous errors; 3 warnings emitted
For more information about this error, try `rustc --explain E0597`.
main.sh: line 2: ./a.out: No such file or directory
Resulting in output: []
Testing if the previous output equals the string [('Darkness,', 1), ('Heaven,', 1), ('Light,', 1), ('age', 2), ('all', 2), ('before', 2), ('belief,', 1), ('best', 1), ('despair,', 1), ('direct', 2), ('epoch', 2), ('everything', 1), ('foolishness,', 1), ('going', 2), ('had', 2), ('hope,', 1), ('incredulity,', 1), ('it', 10), ('nothing', 1), ('of', 10), ('other', 1), ('season', 2), ('spring', 1), ('the', 11), ('times,', 2), ('to', 1), ('us,', 2), ('was', 10), ('way', 1), ('we', 4), ('were', 2), ('winter', 1), ('wisdom,', 1), ('worst', 1)]
: False
I have setup the docker container to run the model evaluation.
Write a self-contained Rust program that prints a JSON output of how often each word appears in a text file located in /tmp/file.txt. So if the file contains "This is is is, an example" then the program should print to stdout. {"This": 1, "is": 2, "is,": 1, "an": 1, "example": 1} Don't import any crates that would require a Cargo.toml file. I'll just compile it with `rustc yourfile.rs` and it should work. The program should be run by calling /path/to/rust_word_count with no arguments. Make it run in parallel on 4 cores at the same time, each job taking ~1/4 of the file. Print out 4 differnt json dicts, one per line. I'll do the merging.
Write a self-contained Rust program that prints a JSON output of how often each word appears in a text file located in /tmp/file.txt. So if the file contains "This is is is, an example" then the program should print to stdout. {"This": 1, "is": 2, "is,": 1, "an": 1, "example": 1} Don't import any crates that would require a Cargo.toml file. I'll just compile it with `rustc yourfile.rs` and it should work. The program should be run by calling /path/to/rust_word_count with no arguments. Make it run in parallel on 4 cores at the same time, each job taking ~1/4 of the file. Print out 4 differnt json dicts, one per line. I'll do the merging.
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 | use std::collections::HashMap; use std::fs::File; use std::io::{BufRead, BufReader}; use std::thread; const NUM_CORES: usize = 4; const CHUNK_SIZE: usize = 1024; fn main() { let file = File::open("/tmp/file.txt").unwrap(); let reader = BufReader::new(file); let mut chunks = Vec::new(); let mut i = 0; for line in reader.lines() { if i % CHUNK_SIZE == 0 { chunks.push(String::new()); } chunks[i / CHUNK_SIZE].push_str(&line.unwrap()); i += 1; } let mut handles = Vec::new(); for chunk in &chunks { let chunk = chunk.clone(); let handle = thread::spawn(move || count_words(&chunk)); handles.push(handle); } for handle in handles { let json = serde_json::to_string(&handle.join().unwrap()).unwrap(); println!("{}", json); } } fn count_words(text: &str) -> HashMap<&str, usize> { let mut map = HashMap::new(); for word in text.split_whitespace() { *map.entry(word).or_insert(0) += 1; } map } |
I extracted the following code from that output:
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 | use std::collections::HashMap; use std::fs::File; use std::io::{BufRead, BufReader}; use std::thread; const NUM_CORES: usize = 4; const CHUNK_SIZE: usize = 1024; fn main() { let file = File::open("/tmp/file.txt").unwrap(); let reader = BufReader::new(file); let mut chunks = Vec::new(); let mut i = 0; for line in reader.lines() { if i % CHUNK_SIZE == 0 { chunks.push(String::new()); } chunks[i / CHUNK_SIZE].push_str(&line.unwrap()); i += 1; } let mut handles = Vec::new(); for chunk in &chunks { let chunk = chunk.clone(); let handle = thread::spawn(move || count_words(&chunk)); handles.push(handle); } for handle in handles { let json = serde_json::to_string(&handle.join().unwrap()).unwrap(); println!("{}", json); } } fn count_words(text: &str) -> HashMap<&str, usize> { let mut map = HashMap::new(); for word in text.split_whitespace() { *map.entry(word).or_insert(0) += 1; } map } |
Below is some student's code. I asked them to parallelize some code. Do not judge if it is correct, I have test cases for that. Logic errors are okay. So are synatx errors. Just tell me if they tried to parallelize it. use std::collections::HashMap; use std::fs::File; use std::io::{BufRead, BufReader}; use std::thread; const NUM_CORES: usize = 4; const CHUNK_SIZE: usize = 1024; fn main() { let file = File::open("/tmp/file.txt").unwrap(); let reader = BufReader::new(file); let mut chunks = Vec::new(); let mut i = 0; for line in reader.lines() { if i % CHUNK_SIZE == 0 { chunks.push(String::new()); } chunks[i / CHUNK_SIZE].push_str(&line.unwrap()); i += 1; } let mut handles = Vec::new(); for chunk in &chunks { let chunk = chunk.clone(); let handle = thread::spawn(move || count_words(&chunk)); handles.push(handle); } for handle in handles { let json = serde_json::to_string(&handle.join().unwrap()).unwrap(); println!("{}", json); } } fn count_words(text: &str) -> HashMap<&str, usize> { let mut map = HashMap::new(); for word in text.split_whitespace() { *map.entry(word).or_insert(0) += 1; } map } Answer either 'The student passes' or 'The student fails'.
The student passes.
Testing if the previous output contains the string student passes
: True
Running the following program:
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 | use std::collections::HashMap; use std::fs::File; use std::io::{BufRead, BufReader}; use std::thread; const NUM_CORES: usize = 4; const CHUNK_SIZE: usize = 1024; fn main() { let file = File::open("/tmp/file.txt").unwrap(); let reader = BufReader::new(file); let mut chunks = Vec::new(); let mut i = 0; for line in reader.lines() { if i % CHUNK_SIZE == 0 { chunks.push(String::new()); } chunks[i / CHUNK_SIZE].push_str(&line.unwrap()); i += 1; } let mut handles = Vec::new(); for chunk in &chunks { let chunk = chunk.clone(); let handle = thread::spawn(move || count_words(&chunk)); handles.push(handle); } for handle in handles { let json = serde_json::to_string(&handle.join().unwrap()).unwrap(); println!("{}", json); } } fn count_words(text: &str) -> HashMap<&str, usize> { let mut map = HashMap::new(); for word in text.split_whitespace() { *map.entry(word).or_insert(0) += 1; } map } |
error[E0433]: failed to resolve: use of undeclared crate or module `serde_json`
--> main.rs:32:20
|
32 | let json = serde_json::to_string(&handle.join().unwrap()).unwrap();
| ^^^^^^^^^^ use of undeclared crate or module `serde_json`
error: aborting due to 1 previous error
For more information about this error, try `rustc --explain E0433`.
main.sh: line 2: ./a.out: No such file or directory
Resulting in output: []
Testing if the previous output equals the string [('Darkness,', 1), ('Heaven,', 1), ('Light,', 1), ('age', 2), ('all', 2), ('before', 2), ('belief,', 1), ('best', 1), ('despair,', 1), ('direct', 2), ('epoch', 2), ('everything', 1), ('foolishness,', 1), ('going', 2), ('had', 2), ('hope,', 1), ('incredulity,', 1), ('it', 10), ('nothing', 1), ('of', 10), ('other', 1), ('season', 2), ('spring', 1), ('the', 11), ('times,', 2), ('to', 1), ('us,', 2), ('was', 10), ('way', 1), ('we', 4), ('were', 2), ('winter', 1), ('wisdom,', 1), ('worst', 1)]
: False
I have setup the docker container to run the model evaluation.
Write a self-contained Rust program that prints a JSON output of how often each word appears in a text file located in /tmp/file.txt. So if the file contains "This is is is, an example" then the program should print to stdout. {"This": 1, "is": 2, "is,": 1, "an": 1, "example": 1} Don't import any crates that would require a Cargo.toml file. I'll just compile it with `rustc yourfile.rs` and it should work. The program should be run by calling /path/to/rust_word_count with no arguments. Make it run in parallel on 4 cores at the same time, each job taking ~1/4 of the file. Print out 4 differnt json dicts, one per line. I'll do the merging.
Write a self-contained Rust program that prints a JSON output of how often each word appears in a text file located in /tmp/file.txt. So if the file contains "This is is is, an example" then the program should print to stdout. {"This": 1, "is": 2, "is,": 1, "an": 1, "example": 1} Don't import any crates that would require a Cargo.toml file. I'll just compile it with `rustc yourfile.rs` and it should work. The program should be run by calling /path/to/rust_word_count with no arguments. Make it run in parallel on 4 cores at the same time, each job taking ~1/4 of the file. Print out 4 differnt json dicts, one per line. I'll do the merging.
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 | fn main() { let contents = std::fs::read_to_string("/tmp/file.txt").unwrap(); let words: Vec<&str> = contents.split_whitespace().collect(); // Split the words into 4 chunks let chunks: Vec<&[&str]> = words.chunks(words.len() / 4).collect(); // Create a thread pool with 4 threads let pool = rayon::ThreadPoolBuilder::new() .num_threads(4) .build() .unwrap(); // Create a vector to store the results let results: Vec<serde_json::Value> = pool.install(|| { chunks .into_iter() .map(|chunk| { let mut counts: std::collections::HashMap<&str, usize> = std::collections::HashMap::new(); for word in chunk { *counts.entry(word).or_insert(0) += 1; } serde_json::to_value(counts).unwrap() }) .collect() }); // Print out the results for result in results { println!("{}", result); } } |
I extracted the following code from that output:
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 | fn main() { let contents = std::fs::read_to_string("/tmp/file.txt").unwrap(); let words: Vec<&str> = contents.split_whitespace().collect(); // Split the words into 4 chunks let chunks: Vec<&[&str]> = words.chunks(words.len() / 4).collect(); // Create a thread pool with 4 threads let pool = rayon::ThreadPoolBuilder::new() .num_threads(4) .build() .unwrap(); // Create a vector to store the results let results: Vec<serde_json::Value> = pool.install(|| { chunks .into_iter() .map(|chunk| { let mut counts: std::collections::HashMap<&str, usize> = std::collections::HashMap::new(); for word in chunk { *counts.entry(word).or_insert(0) += 1; } serde_json::to_value(counts).unwrap() }) .collect() }); // Print out the results for result in results { println!("{}", result); } } |
Below is some student's code. I asked them to parallelize some code. Do not judge if it is correct, I have test cases for that. Logic errors are okay. So are synatx errors. Just tell me if they tried to parallelize it. fn main() { let contents = std::fs::read_to_string("/tmp/file.txt").unwrap(); let words: Vec<&str> = contents.split_whitespace().collect(); // Split the words into 4 chunks let chunks: Vec<&[&str]> = words.chunks(words.len() / 4).collect(); // Create a thread pool with 4 threads let pool = rayon::ThreadPoolBuilder::new() .num_threads(4) .build() .unwrap(); // Create a vector to store the results let results: Vec<serde_json::Value> = pool.install(|| { chunks .into_iter() .map(|chunk| { let mut counts: std::collections::HashMap<&str, usize> = std::collections::HashMap::new(); for word in chunk { *counts.entry(word).or_insert(0) += 1; } serde_json::to_value(counts).unwrap() }) .collect() }); // Print out the results for result in results { println!("{}", result); } } Answer either 'The student passes' or 'The student fails'.
The student passes.
Testing if the previous output contains the string student passes
: True
Running the following program:
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 | fn main() { let contents = std::fs::read_to_string("/tmp/file.txt").unwrap(); let words: Vec<&str> = contents.split_whitespace().collect(); // Split the words into 4 chunks let chunks: Vec<&[&str]> = words.chunks(words.len() / 4).collect(); // Create a thread pool with 4 threads let pool = rayon::ThreadPoolBuilder::new() .num_threads(4) .build() .unwrap(); // Create a vector to store the results let results: Vec<serde_json::Value> = pool.install(|| { chunks .into_iter() .map(|chunk| { let mut counts: std::collections::HashMap<&str, usize> = std::collections::HashMap::new(); for word in chunk { *counts.entry(word).or_insert(0) += 1; } serde_json::to_value(counts).unwrap() }) .collect() }); // Print out the results for result in results { println!("{}", result); } } |
error[E0433]: failed to resolve: use of undeclared crate or module `rayon`
--> main.rs:10:16
|
10 | let pool = rayon::ThreadPoolBuilder::new()
| ^^^^^ use of undeclared crate or module `rayon`
error[E0433]: failed to resolve: use of undeclared crate or module `serde_json`
--> main.rs:25:17
|
25 | serde_json::to_value(counts).unwrap()
| ^^^^^^^^^^ use of undeclared crate or module `serde_json`
error[E0433]: failed to resolve: use of undeclared crate or module `serde_json`
--> main.rs:16:22
|
16 | let results: Vec<serde_json::Value> = pool.install(|| {
| ^^^^^^^^^^ use of undeclared crate or module `serde_json`
error: aborting due to 3 previous errors
For more information about this error, try `rustc --explain E0433`.
main.sh: line 2: ./a.out: No such file or directory
Resulting in output: []
Testing if the previous output equals the string [('Darkness,', 1), ('Heaven,', 1), ('Light,', 1), ('age', 2), ('all', 2), ('before', 2), ('belief,', 1), ('best', 1), ('despair,', 1), ('direct', 2), ('epoch', 2), ('everything', 1), ('foolishness,', 1), ('going', 2), ('had', 2), ('hope,', 1), ('incredulity,', 1), ('it', 10), ('nothing', 1), ('of', 10), ('other', 1), ('season', 2), ('spring', 1), ('the', 11), ('times,', 2), ('to', 1), ('us,', 2), ('was', 10), ('way', 1), ('we', 4), ('were', 2), ('winter', 1), ('wisdom,', 1), ('worst', 1)]
: False
I have setup the docker container to run the model evaluation.
Write a self-contained Rust program that prints a JSON output of how often each word appears in a text file located in /tmp/file.txt. So if the file contains "This is is is, an example" then the program should print to stdout. {"This": 1, "is": 2, "is,": 1, "an": 1, "example": 1} Don't import any crates that would require a Cargo.toml file. I'll just compile it with `rustc yourfile.rs` and it should work. The program should be run by calling /path/to/rust_word_count with no arguments. Make it run in parallel on 4 cores at the same time, each job taking ~1/4 of the file. Print out 4 differnt json dicts, one per line. I'll do the merging.
Write a self-contained Rust program that prints a JSON output of how often each word appears in a text file located in /tmp/file.txt. So if the file contains "This is is is, an example" then the program should print to stdout. {"This": 1, "is": 2, "is,": 1, "an": 1, "example": 1} Don't import any crates that would require a Cargo.toml file. I'll just compile it with `rustc yourfile.rs` and it should work. The program should be run by calling /path/to/rust_word_count with no arguments. Make it run in parallel on 4 cores at the same time, each job taking ~1/4 of the file. Print out 4 differnt json dicts, one per line. I'll do the merging.
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 | use std::collections::HashMap; use std::fs::File; use std::io::{BufRead, BufReader}; use std::sync::{Arc, Mutex}; use std::thread; fn main() { let mut args = std::env::args(); args.next().unwrap(); // Discard program name let filepath = args.next().unwrap(); let file = File::open(filepath).unwrap(); let file = BufReader::new(file); let lines_per_thread = file.lines().count() / 4; let mut handles = Vec::new(); let mut results = Vec::new(); for _ in 0..4 { let file = file.clone(); let results = Arc::new(Mutex::new(HashMap::new())); let handle = thread::spawn(move || { let mut lines = file.lines().skip(lines_per_thread).take(lines_per_thread); for line in lines { let line = line.unwrap(); let mut words = line.split_whitespace(); for word in words { let count = results.lock().unwrap().entry(word).or_insert(0); *count += 1; } } }); handles.push(handle); results.push(results); } for handle in handles { handle.join().unwrap(); } for result in results { println!("{}", serde_json::to_string(&*result.lock().unwrap()).unwrap()); } } |
I extracted the following code from that output:
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 | use std::collections::HashMap; use std::fs::File; use std::io::{BufRead, BufReader}; use std::sync::{Arc, Mutex}; use std::thread; fn main() { let mut args = std::env::args(); args.next().unwrap(); // Discard program name let filepath = args.next().unwrap(); let file = File::open(filepath).unwrap(); let file = BufReader::new(file); let lines_per_thread = file.lines().count() / 4; let mut handles = Vec::new(); let mut results = Vec::new(); for _ in 0..4 { let file = file.clone(); let results = Arc::new(Mutex::new(HashMap::new())); let handle = thread::spawn(move || { let mut lines = file.lines().skip(lines_per_thread).take(lines_per_thread); for line in lines { let line = line.unwrap(); let mut words = line.split_whitespace(); for word in words { let count = results.lock().unwrap().entry(word).or_insert(0); *count += 1; } } }); handles.push(handle); results.push(results); } for handle in handles { handle.join().unwrap(); } for result in results { println!("{}", serde_json::to_string(&*result.lock().unwrap()).unwrap()); } } |
Below is some student's code. I asked them to parallelize some code. Do not judge if it is correct, I have test cases for that. Logic errors are okay. So are synatx errors. Just tell me if they tried to parallelize it. use std::collections::HashMap; use std::fs::File; use std::io::{BufRead, BufReader}; use std::sync::{Arc, Mutex}; use std::thread; fn main() { let mut args = std::env::args(); args.next().unwrap(); // Discard program name let filepath = args.next().unwrap(); let file = File::open(filepath).unwrap(); let file = BufReader::new(file); let lines_per_thread = file.lines().count() / 4; let mut handles = Vec::new(); let mut results = Vec::new(); for _ in 0..4 { let file = file.clone(); let results = Arc::new(Mutex::new(HashMap::new())); let handle = thread::spawn(move || { let mut lines = file.lines().skip(lines_per_thread).take(lines_per_thread); for line in lines { let line = line.unwrap(); let mut words = line.split_whitespace(); for word in words { let count = results.lock().unwrap().entry(word).or_insert(0); *count += 1; } } }); handles.push(handle); results.push(results); } for handle in handles { handle.join().unwrap(); } for result in results { println!("{}", serde_json::to_string(&*result.lock().unwrap()).unwrap()); } } Answer either 'The student passes' or 'The student fails'.
The student passes.
Testing if the previous output contains the string student passes
: True
Running the following program:
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 | use std::collections::HashMap; use std::fs::File; use std::io::{BufRead, BufReader}; use std::sync::{Arc, Mutex}; use std::thread; fn main() { let mut args = std::env::args(); args.next().unwrap(); // Discard program name let filepath = args.next().unwrap(); let file = File::open(filepath).unwrap(); let file = BufReader::new(file); let lines_per_thread = file.lines().count() / 4; let mut handles = Vec::new(); let mut results = Vec::new(); for _ in 0..4 { let file = file.clone(); let results = Arc::new(Mutex::new(HashMap::new())); let handle = thread::spawn(move || { let mut lines = file.lines().skip(lines_per_thread).take(lines_per_thread); for line in lines { let line = line.unwrap(); let mut words = line.split_whitespace(); for word in words { let count = results.lock().unwrap().entry(word).or_insert(0); *count += 1; } } }); handles.push(handle); results.push(results); } for handle in handles { handle.join().unwrap(); } for result in results { println!("{}", serde_json::to_string(&*result.lock().unwrap()).unwrap()); } } |
error[E0599]: no method named `clone` found for struct `BufReader` in the current scope
--> main.rs:22:25
|
22 | let file = file.clone();
| ^^^^^ method not found in `BufReader<File>`
error[E0599]: no method named `push` found for struct `Arc<Mutex<HashMap<_, {integer}>>>` in the current scope
--> main.rs:36:17
|
36 | results.push(results);
| ^^^^ method not found in `Arc<Mutex<HashMap<_, {integer}>>>`
error[E0433]: failed to resolve: use of undeclared crate or module `serde_json`
--> main.rs:44:24
|
44 | println!("{}", serde_json::to_string(&*result.lock().unwrap()).unwrap());
| ^^^^^^^^^^ use of undeclared crate or module `serde_json`
error: aborting due to 3 previous errors
Some errors have detailed explanations: E0433, E0599.
For more information about an error, try `rustc --explain E0433`.
main.sh: line 2: ./a.out: No such file or directory
Resulting in output: []
Testing if the previous output equals the string [('Darkness,', 1), ('Heaven,', 1), ('Light,', 1), ('age', 2), ('all', 2), ('before', 2), ('belief,', 1), ('best', 1), ('despair,', 1), ('direct', 2), ('epoch', 2), ('everything', 1), ('foolishness,', 1), ('going', 2), ('had', 2), ('hope,', 1), ('incredulity,', 1), ('it', 10), ('nothing', 1), ('of', 10), ('other', 1), ('season', 2), ('spring', 1), ('the', 11), ('times,', 2), ('to', 1), ('us,', 2), ('was', 10), ('way', 1), ('we', 4), ('were', 2), ('winter', 1), ('wisdom,', 1), ('worst', 1)]
: False