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 | use std::collections::HashMap; use std::fs::File; use std::io::{self, BufRead}; use std::sync::{Arc, Mutex}; use std::thread; fn count_words_in_chunk(chunk: &str) -> HashMap<String, u32> { let mut word_count = HashMap::new(); for word in chunk.split_whitespace() { *word_count.entry(word.to_string()).or_insert(0) += 1; } word_count } fn main() { let file = File::open("/tmp/file.txt").expect("Unable to open file"); let reader = io::BufReader::new(file); let lines: Vec<_> = reader.lines().map(|line| line.unwrap()).collect(); let chunk_size = lines.len() / 4; let counts: Arc<Mutex<Vec<HashMap<String, u32>>>> = Arc::new(Mutex::new(Vec::new())); let mut handles = vec![]; for chunk in lines.chunks(chunk_size) { let counts_clone = counts.clone(); let handle = thread::spawn(move || { let count = count_words_in_chunk(&chunk.join("\n")); counts_clone.lock().unwrap().push(count); }); handles.push(handle); } for handle in handles { handle.join().unwrap(); } for count in counts.lock().unwrap().iter() { println!("{:?}", 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 | use std::collections::HashMap; use std::fs::File; use std::io::{self, BufRead}; use std::sync::{Arc, Mutex}; use std::thread; fn count_words_in_chunk(chunk: &str) -> HashMap<String, u32> { let mut word_count = HashMap::new(); for word in chunk.split_whitespace() { *word_count.entry(word.to_string()).or_insert(0) += 1; } word_count } fn main() { let file = File::open("/tmp/file.txt").expect("Unable to open file"); let reader = io::BufReader::new(file); let lines: Vec<_> = reader.lines().map(|line| line.unwrap()).collect(); let chunk_size = lines.len() / 4; let counts: Arc<Mutex<Vec<HashMap<String, u32>>>> = Arc::new(Mutex::new(Vec::new())); let mut handles = vec![]; for chunk in lines.chunks(chunk_size) { let counts_clone = counts.clone(); let handle = thread::spawn(move || { let count = count_words_in_chunk(&chunk.join("\n")); counts_clone.lock().unwrap().push(count); }); handles.push(handle); } for handle in handles { handle.join().unwrap(); } for count in counts.lock().unwrap().iter() { println!("{:?}", 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; use std::io::{self, BufRead}; use std::sync::{Arc, Mutex}; use std::thread; fn count_words_in_chunk(chunk: &str) -> HashMap<String, u32> { let mut word_count = HashMap::new(); for word in chunk.split_whitespace() { *word_count.entry(word.to_string()).or_insert(0) += 1; } word_count } fn main() { let file = File::open("/tmp/file.txt").expect("Unable to open file"); let reader = io::BufReader::new(file); let lines: Vec<_> = reader.lines().map(|line| line.unwrap()).collect(); let chunk_size = lines.len() / 4; let counts: Arc<Mutex<Vec<HashMap<String, u32>>>> = Arc::new(Mutex::new(Vec::new())); let mut handles = vec![]; for chunk in lines.chunks(chunk_size) { let counts_clone = counts.clone(); let handle = thread::spawn(move || { let count = count_words_in_chunk(&chunk.join("\n")); counts_clone.lock().unwrap().push(count); }); handles.push(handle); } for handle in handles { handle.join().unwrap(); } for count in counts.lock().unwrap().iter() { println!("{:?}", 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 | use std::collections::HashMap; use std::fs::File; use std::io::{self, BufRead}; use std::sync::{Arc, Mutex}; use std::thread; fn count_words_in_chunk(chunk: &str) -> HashMap<String, u32> { let mut word_count = HashMap::new(); for word in chunk.split_whitespace() { *word_count.entry(word.to_string()).or_insert(0) += 1; } word_count } fn main() { let file = File::open("/tmp/file.txt").expect("Unable to open file"); let reader = io::BufReader::new(file); let lines: Vec<_> = reader.lines().map(|line| line.unwrap()).collect(); let chunk_size = lines.len() / 4; let counts: Arc<Mutex<Vec<HashMap<String, u32>>>> = Arc::new(Mutex::new(Vec::new())); let mut handles = vec![]; for chunk in lines.chunks(chunk_size) { let counts_clone = counts.clone(); let handle = thread::spawn(move || { let count = count_words_in_chunk(&chunk.join("\n")); counts_clone.lock().unwrap().push(count); }); handles.push(handle); } for handle in handles { handle.join().unwrap(); } for count in counts.lock().unwrap().iter() { println!("{:?}", count); } } |
error[E0597]: `lines` does not live long enough
--> main.rs:25:18
|
19 | let lines: Vec<_> = reader.lines().map(|line| line.unwrap()).collect();
| ----- binding `lines` declared here
...
25 | for chunk in lines.chunks(chunk_size) {
| ^^^^^ borrowed value does not live long enough
26 | let counts_clone = counts.clone();
27 | let handle = thread::spawn(move || {
| ______________________-
28 | | let count = count_words_in_chunk(&chunk.join("\n"));
29 | | counts_clone.lock().unwrap().push(count);
30 | | });
| |__________- argument requires that `lines` is borrowed for `'static`
...
41 | }
| - `lines` dropped here while still borrowed
error: aborting due to 1 previous error
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 | use std::fs::File; use std::io::{BufReader, Read}; use std::collections::HashMap; use std::sync::{Arc, Mutex}; use std::thread; fn count_words(text: &str) -> HashMap<String, u32> { let mut word_count = HashMap::new(); for word in text.split_whitespace() { *word_count.entry(word.to_string()).or_insert(0) += 1; } word_count } fn main() { let file = File::open("/tmp/file.txt").expect("unable to open file"); let mut buf_reader = BufReader::new(file); let mut contents = String::new(); buf_reader.read_to_string(&mut contents).expect("unable to read file"); let chunk_size = contents.len() / 4; let shared_contents = Arc::new(contents); let mut handles = vec![]; for i in 0..4 { let shared_contents = shared_contents.clone(); let start = i * chunk_size; let end = if i == 3 { shared_contents.len() } else { (i + 1) * chunk_size }; let chunk = &shared_contents[start..end]; let handle = thread::spawn(move || { let word_count = count_words(chunk); let json_output = serde_json::to_string(&word_count).unwrap(); println!("{}", json_output); }); handles.push(handle); } for handle in handles { handle.join().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 46 47 | use std::fs::File; use std::io::{BufReader, Read}; use std::collections::HashMap; use std::sync::{Arc, Mutex}; use std::thread; fn count_words(text: &str) -> HashMap<String, u32> { let mut word_count = HashMap::new(); for word in text.split_whitespace() { *word_count.entry(word.to_string()).or_insert(0) += 1; } word_count } fn main() { let file = File::open("/tmp/file.txt").expect("unable to open file"); let mut buf_reader = BufReader::new(file); let mut contents = String::new(); buf_reader.read_to_string(&mut contents).expect("unable to read file"); let chunk_size = contents.len() / 4; let shared_contents = Arc::new(contents); let mut handles = vec![]; for i in 0..4 { let shared_contents = shared_contents.clone(); let start = i * chunk_size; let end = if i == 3 { shared_contents.len() } else { (i + 1) * chunk_size }; let chunk = &shared_contents[start..end]; let handle = thread::spawn(move || { let word_count = count_words(chunk); let json_output = serde_json::to_string(&word_count).unwrap(); println!("{}", json_output); }); handles.push(handle); } for handle in handles { handle.join().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::fs::File; use std::io::{BufReader, Read}; use std::collections::HashMap; use std::sync::{Arc, Mutex}; use std::thread; fn count_words(text: &str) -> HashMap<String, u32> { let mut word_count = HashMap::new(); for word in text.split_whitespace() { *word_count.entry(word.to_string()).or_insert(0) += 1; } word_count } fn main() { let file = File::open("/tmp/file.txt").expect("unable to open file"); let mut buf_reader = BufReader::new(file); let mut contents = String::new(); buf_reader.read_to_string(&mut contents).expect("unable to read file"); let chunk_size = contents.len() / 4; let shared_contents = Arc::new(contents); let mut handles = vec![]; for i in 0..4 { let shared_contents = shared_contents.clone(); let start = i * chunk_size; let end = if i == 3 { shared_contents.len() } else { (i + 1) * chunk_size }; let chunk = &shared_contents[start..end]; let handle = thread::spawn(move || { let word_count = count_words(chunk); let json_output = serde_json::to_string(&word_count).unwrap(); println!("{}", json_output); }); handles.push(handle); } for handle in handles { handle.join().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 46 47 | use std::fs::File; use std::io::{BufReader, Read}; use std::collections::HashMap; use std::sync::{Arc, Mutex}; use std::thread; fn count_words(text: &str) -> HashMap<String, u32> { let mut word_count = HashMap::new(); for word in text.split_whitespace() { *word_count.entry(word.to_string()).or_insert(0) += 1; } word_count } fn main() { let file = File::open("/tmp/file.txt").expect("unable to open file"); let mut buf_reader = BufReader::new(file); let mut contents = String::new(); buf_reader.read_to_string(&mut contents).expect("unable to read file"); let chunk_size = contents.len() / 4; let shared_contents = Arc::new(contents); let mut handles = vec![]; for i in 0..4 { let shared_contents = shared_contents.clone(); let start = i * chunk_size; let end = if i == 3 { shared_contents.len() } else { (i + 1) * chunk_size }; let chunk = &shared_contents[start..end]; let handle = thread::spawn(move || { let word_count = count_words(chunk); let json_output = serde_json::to_string(&word_count).unwrap(); println!("{}", json_output); }); handles.push(handle); } for handle in handles { handle.join().unwrap(); } } |
warning: unused import: `Mutex`
--> main.rs:5:22
|
5 | use std::sync::{Arc, Mutex};
| ^^^^^
|
= note: `#[warn(unused_imports)]` on by default
error[E0433]: failed to resolve: use of undeclared crate or module `serde_json`
--> main.rs:38:31
|
38 | let json_output = serde_json::to_string(&word_count).unwrap();
| ^^^^^^^^^^ use of undeclared crate or module `serde_json`
error: aborting due to 1 previous error; 1 warning emitted
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 46 47 48 | use std::collections::HashMap; use std::fs::File; use std::io::{BufRead, BufReader}; use std::sync::{Arc, Mutex}; use std::thread; fn count_words_in_text(text: &str) -> HashMap<String, u32> { let mut word_count = HashMap::new(); for word in text.split_whitespace() { *word_count.entry(word.to_string()).or_insert(0) += 1; } word_count } fn main() { let file = File::open("/tmp/file.txt").expect("Unable to open file"); let reader = BufReader::new(file); let lines: Vec<_> = reader.lines().map(|line| line.unwrap()).collect(); let chunk_size = (lines.len() as f64 / 4.0).ceil() as usize; let results: Arc<Mutex<Vec<HashMap<String, u32>>> = Arc::new(Mutex::new(vec![])); let handles: Vec<_> = (0..4) .map(|i| { let lines = lines.clone(); let results = results.clone(); thread::spawn(move || { let start = i * chunk_size; let end = (start + chunk_size).min(lines.len()); let chunk_text: String = lines[start..end].join("\n"); let word_count = count_words_in_text(&chunk_text); let mut results = results.lock().unwrap(); results.push(word_count); }) }) .collect(); for handle in handles { handle.join().unwrap(); } let results = results.lock().unwrap(); 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 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 | use std::collections::HashMap; use std::fs::File; use std::io::{BufRead, BufReader}; use std::sync::{Arc, Mutex}; use std::thread; fn count_words_in_text(text: &str) -> HashMap<String, u32> { let mut word_count = HashMap::new(); for word in text.split_whitespace() { *word_count.entry(word.to_string()).or_insert(0) += 1; } word_count } fn main() { let file = File::open("/tmp/file.txt").expect("Unable to open file"); let reader = BufReader::new(file); let lines: Vec<_> = reader.lines().map(|line| line.unwrap()).collect(); let chunk_size = (lines.len() as f64 / 4.0).ceil() as usize; let results: Arc<Mutex<Vec<HashMap<String, u32>>> = Arc::new(Mutex::new(vec![])); let handles: Vec<_> = (0..4) .map(|i| { let lines = lines.clone(); let results = results.clone(); thread::spawn(move || { let start = i * chunk_size; let end = (start + chunk_size).min(lines.len()); let chunk_text: String = lines[start..end].join("\n"); let word_count = count_words_in_text(&chunk_text); let mut results = results.lock().unwrap(); results.push(word_count); }) }) .collect(); for handle in handles { handle.join().unwrap(); } let results = results.lock().unwrap(); 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. use std::collections::HashMap; use std::fs::File; use std::io::{BufRead, BufReader}; use std::sync::{Arc, Mutex}; use std::thread; fn count_words_in_text(text: &str) -> HashMap<String, u32> { let mut word_count = HashMap::new(); for word in text.split_whitespace() { *word_count.entry(word.to_string()).or_insert(0) += 1; } word_count } fn main() { let file = File::open("/tmp/file.txt").expect("Unable to open file"); let reader = BufReader::new(file); let lines: Vec<_> = reader.lines().map(|line| line.unwrap()).collect(); let chunk_size = (lines.len() as f64 / 4.0).ceil() as usize; let results: Arc<Mutex<Vec<HashMap<String, u32>>> = Arc::new(Mutex::new(vec![])); let handles: Vec<_> = (0..4) .map(|i| { let lines = lines.clone(); let results = results.clone(); thread::spawn(move || { let start = i * chunk_size; let end = (start + chunk_size).min(lines.len()); let chunk_text: String = lines[start..end].join("\n"); let word_count = count_words_in_text(&chunk_text); let mut results = results.lock().unwrap(); results.push(word_count); }) }) .collect(); for handle in handles { handle.join().unwrap(); } let results = results.lock().unwrap(); 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 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 | use std::collections::HashMap; use std::fs::File; use std::io::{BufRead, BufReader}; use std::sync::{Arc, Mutex}; use std::thread; fn count_words_in_text(text: &str) -> HashMap<String, u32> { let mut word_count = HashMap::new(); for word in text.split_whitespace() { *word_count.entry(word.to_string()).or_insert(0) += 1; } word_count } fn main() { let file = File::open("/tmp/file.txt").expect("Unable to open file"); let reader = BufReader::new(file); let lines: Vec<_> = reader.lines().map(|line| line.unwrap()).collect(); let chunk_size = (lines.len() as f64 / 4.0).ceil() as usize; let results: Arc<Mutex<Vec<HashMap<String, u32>>> = Arc::new(Mutex::new(vec![])); let handles: Vec<_> = (0..4) .map(|i| { let lines = lines.clone(); let results = results.clone(); thread::spawn(move || { let start = i * chunk_size; let end = (start + chunk_size).min(lines.len()); let chunk_text: String = lines[start..end].join("\n"); let word_count = count_words_in_text(&chunk_text); let mut results = results.lock().unwrap(); results.push(word_count); }) }) .collect(); for handle in handles { handle.join().unwrap(); } let results = results.lock().unwrap(); for result in &*results { println!("{:?}", result); } } |
error: expected one of `!`, `+`, `,`, `->`, `::`, or `>`, found `;`
--> main.rs:22:85
|
22 | let results: Arc<Mutex<Vec<HashMap<String, u32>>> = Arc::new(Mutex::new(vec![]));
| ^ expected one of `!`, `+`, `,`, `->`, `::`, or `>`
|
help: use a comma to separate type parameters
|
22 | let results: Arc<Mutex<Vec<HashMap<String, u32>>> = Arc::new(Mutex::new(vec![])), let handles: Vec<_> = (0..4)
| ~
error: expected expression, found `let` statement
--> main.rs:24:5
|
24 | let handles: Vec<_> = (0..4)
| ^^^
|
= note: only supported directly in conditions of `if` and `while` expressions
error: expected one of `@` or `|`, found `:`
--> main.rs:24:16
|
24 | let handles: Vec<_> = (0..4)
| ^ ------ specifying the type of a pattern isn't supported
| |
| expected one of `@` or `|`
error: invalid const generic expression
--> main.rs:24:5
|
24 | / let handles: Vec<_> = (0..4)
25 | | .map(|i| {
26 | | let lines = lines.clone();
27 | | let results = results.clone();
... |
38 | | })
39 | | .collect();
| |__________________^
|
help: expressions must be enclosed in braces to be used as const generic arguments
|
24 ~ { let handles: Vec<_> = (0..4)
25 | .map(|i| {
...
38 | })
39 ~ .collect() };
|
error: expected one of `,`, `.`, `>`, `?`, or an operator, found `;`
--> main.rs:39:19
|
39 | .collect();
| ^ expected one of `,`, `.`, `>`, `?`, or an operator
|
help: use a comma to separate type parameters
|
39 | .collect(), for handle in handles {
| ~
error: expected `<`, found `handle`
--> main.rs:41:9
|
22 | let results: Arc<Mutex<Vec<HashMap<String, u32>>> = Arc::new(Mutex::new(vec![]));
| ------- while parsing the type for `results`
...
41 | for handle in handles {
| ^^^^^^ expected `<`
warning: unused imports: `Arc`, `Mutex`
--> main.rs:5:17
|
5 | use std::sync::{Arc, Mutex};
| ^^^ ^^^^^
|
= note: `#[warn(unused_imports)]` on by default
warning: unused import: `std::thread`
--> main.rs:6:5
|
6 | use std::thread;
| ^^^^^^^^^^^
error: aborting due to 6 previous errors; 2 warnings emitted
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 53 54 55 56 57 58 59 60 61 62 | use std::collections::HashMap; use std::fs::File; use std::io::{BufRead, BufReader}; use std::sync::{Arc, Mutex}; use std::thread; fn count_words(filename: &str, start: usize, end: usize) -> HashMap<String, u32> { let file = File::open(filename).expect("Failed to open file"); let reader = BufReader::new(file); let mut word_count = HashMap::new(); let lines: Vec<String> = reader.lines().map(|line| line.unwrap()).collect(); let chunk = &lines[start..end]; for line in chunk { let words: Vec<&str> = line.split_whitespace().collect(); for word in words { *word_count.entry(word.to_string()).or_insert(0) += 1; } } word_count } fn main() { let filename = "/tmp/file.txt"; let file = File::open(filename).expect("Failed to open file"); let reader = BufReader::new(file); let total_lines = reader.lines().count(); let chunk_size = total_lines / 4; let mut handles = vec![]; let result: Arc<Mutex<Vec<HashMap<String, u32>>>> = Arc::new(Mutex::new(vec![])); for i in 0..4 { let start = chunk_size * i; let end = if i < 3 { chunk_size * (i + 1) } else { total_lines }; let filename = filename.to_string(); let result = Arc::clone(&result); let handle = thread::spawn(move || { let word_count = count_words(&filename, start, end); result.lock().unwrap().push(word_count); }); handles.push(handle); } for handle in handles { handle.join().unwrap(); } let final_result = result.lock().unwrap(); for word_count in final_result.iter() { 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 53 54 55 56 57 58 59 60 61 62 | use std::collections::HashMap; use std::fs::File; use std::io::{BufRead, BufReader}; use std::sync::{Arc, Mutex}; use std::thread; fn count_words(filename: &str, start: usize, end: usize) -> HashMap<String, u32> { let file = File::open(filename).expect("Failed to open file"); let reader = BufReader::new(file); let mut word_count = HashMap::new(); let lines: Vec<String> = reader.lines().map(|line| line.unwrap()).collect(); let chunk = &lines[start..end]; for line in chunk { let words: Vec<&str> = line.split_whitespace().collect(); for word in words { *word_count.entry(word.to_string()).or_insert(0) += 1; } } word_count } fn main() { let filename = "/tmp/file.txt"; let file = File::open(filename).expect("Failed to open file"); let reader = BufReader::new(file); let total_lines = reader.lines().count(); let chunk_size = total_lines / 4; let mut handles = vec![]; let result: Arc<Mutex<Vec<HashMap<String, u32>>>> = Arc::new(Mutex::new(vec![])); for i in 0..4 { let start = chunk_size * i; let end = if i < 3 { chunk_size * (i + 1) } else { total_lines }; let filename = filename.to_string(); let result = Arc::clone(&result); let handle = thread::spawn(move || { let word_count = count_words(&filename, start, end); result.lock().unwrap().push(word_count); }); handles.push(handle); } for handle in handles { handle.join().unwrap(); } let final_result = result.lock().unwrap(); for word_count in final_result.iter() { 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; use std::io::{BufRead, BufReader}; use std::sync::{Arc, Mutex}; use std::thread; fn count_words(filename: &str, start: usize, end: usize) -> HashMap<String, u32> { let file = File::open(filename).expect("Failed to open file"); let reader = BufReader::new(file); let mut word_count = HashMap::new(); let lines: Vec<String> = reader.lines().map(|line| line.unwrap()).collect(); let chunk = &lines[start..end]; for line in chunk { let words: Vec<&str> = line.split_whitespace().collect(); for word in words { *word_count.entry(word.to_string()).or_insert(0) += 1; } } word_count } fn main() { let filename = "/tmp/file.txt"; let file = File::open(filename).expect("Failed to open file"); let reader = BufReader::new(file); let total_lines = reader.lines().count(); let chunk_size = total_lines / 4; let mut handles = vec![]; let result: Arc<Mutex<Vec<HashMap<String, u32>>>> = Arc::new(Mutex::new(vec![])); for i in 0..4 { let start = chunk_size * i; let end = if i < 3 { chunk_size * (i + 1) } else { total_lines }; let filename = filename.to_string(); let result = Arc::clone(&result); let handle = thread::spawn(move || { let word_count = count_words(&filename, start, end); result.lock().unwrap().push(word_count); }); handles.push(handle); } for handle in handles { handle.join().unwrap(); } let final_result = result.lock().unwrap(); for word_count in final_result.iter() { 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 53 54 55 56 57 58 59 60 61 62 | use std::collections::HashMap; use std::fs::File; use std::io::{BufRead, BufReader}; use std::sync::{Arc, Mutex}; use std::thread; fn count_words(filename: &str, start: usize, end: usize) -> HashMap<String, u32> { let file = File::open(filename).expect("Failed to open file"); let reader = BufReader::new(file); let mut word_count = HashMap::new(); let lines: Vec<String> = reader.lines().map(|line| line.unwrap()).collect(); let chunk = &lines[start..end]; for line in chunk { let words: Vec<&str> = line.split_whitespace().collect(); for word in words { *word_count.entry(word.to_string()).or_insert(0) += 1; } } word_count } fn main() { let filename = "/tmp/file.txt"; let file = File::open(filename).expect("Failed to open file"); let reader = BufReader::new(file); let total_lines = reader.lines().count(); let chunk_size = total_lines / 4; let mut handles = vec![]; let result: Arc<Mutex<Vec<HashMap<String, u32>>>> = Arc::new(Mutex::new(vec![])); for i in 0..4 { let start = chunk_size * i; let end = if i < 3 { chunk_size * (i + 1) } else { total_lines }; let filename = filename.to_string(); let result = Arc::clone(&result); let handle = thread::spawn(move || { let word_count = count_words(&filename, start, end); result.lock().unwrap().push(word_count); }); handles.push(handle); } for handle in handles { handle.join().unwrap(); } let final_result = result.lock().unwrap(); for word_count in final_result.iter() { println!("{:?}", word_count); } } |
{}
{}
{}
{"other": 1, "despair,": 1, "Light,": 1, "Heaven,": 1, "best": 1, "wisdom,": 1, "the": 11, "times,": 2, "were": 2, "winter": 1, "to": 1, "incredulity,": 1, "age": 2, "going": 2, "way": 1, "everything": 1, "spring": 1, "us,": 2, "it": 10, "nothing": 1, "direct": 2, "season": 2, "worst": 1, "foolishness,": 1, "before": 2, "hope,": 1, "was": 10, "of": 10, "all": 2, "epoch": 2, "Darkness,": 1, "belief,": 1, "we": 4, "had": 2}
Resulting in output: [('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)]
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)]
: True
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 | use std::collections::HashMap; use std::fs::File; use std::io::{BufRead, BufReader}; use std::sync::{Arc, Mutex}; use std::thread; fn count_words_in_chunk(chunk: Vec<String>) -> HashMap<String, usize> { let mut word_count = HashMap::new(); for line in chunk { for word in line.split_whitespace() { *word_count.entry(word.to_string()).or_insert(0) += 1; } } word_count } fn main() { let file = File::open("/tmp/file.txt").expect("Failed to open file"); let reader = BufReader::new(file); let lines: Vec<_> = reader.lines().map(|l| l.unwrap()).collect(); let chunk_size = lines.len() / 4; let chunks: Vec<_> = lines.chunks(chunk_size).map(|chunk| chunk.to_vec()).collect(); let results: Vec<_> = (0..4).into_iter().map(|i| { let chunk = chunks[i].clone(); thread::spawn(move || count_words_in_chunk(chunk)) }).collect(); for result in results { let word_count = result.join().unwrap(); let json_output = serde_json::to_string(&word_count).unwrap(); println!("{}", json_output); } } |
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 | use std::collections::HashMap; use std::fs::File; use std::io::{BufRead, BufReader}; use std::sync::{Arc, Mutex}; use std::thread; fn count_words_in_chunk(chunk: Vec<String>) -> HashMap<String, usize> { let mut word_count = HashMap::new(); for line in chunk { for word in line.split_whitespace() { *word_count.entry(word.to_string()).or_insert(0) += 1; } } word_count } fn main() { let file = File::open("/tmp/file.txt").expect("Failed to open file"); let reader = BufReader::new(file); let lines: Vec<_> = reader.lines().map(|l| l.unwrap()).collect(); let chunk_size = lines.len() / 4; let chunks: Vec<_> = lines.chunks(chunk_size).map(|chunk| chunk.to_vec()).collect(); let results: Vec<_> = (0..4).into_iter().map(|i| { let chunk = chunks[i].clone(); thread::spawn(move || count_words_in_chunk(chunk)) }).collect(); for result in results { let word_count = result.join().unwrap(); let json_output = serde_json::to_string(&word_count).unwrap(); println!("{}", json_output); } } |
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 count_words_in_chunk(chunk: Vec<String>) -> HashMap<String, usize> { let mut word_count = HashMap::new(); for line in chunk { for word in line.split_whitespace() { *word_count.entry(word.to_string()).or_insert(0) += 1; } } word_count } fn main() { let file = File::open("/tmp/file.txt").expect("Failed to open file"); let reader = BufReader::new(file); let lines: Vec<_> = reader.lines().map(|l| l.unwrap()).collect(); let chunk_size = lines.len() / 4; let chunks: Vec<_> = lines.chunks(chunk_size).map(|chunk| chunk.to_vec()).collect(); let results: Vec<_> = (0..4).into_iter().map(|i| { let chunk = chunks[i].clone(); thread::spawn(move || count_words_in_chunk(chunk)) }).collect(); for result in results { let word_count = result.join().unwrap(); let json_output = serde_json::to_string(&word_count).unwrap(); println!("{}", json_output); } } 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 | use std::collections::HashMap; use std::fs::File; use std::io::{BufRead, BufReader}; use std::sync::{Arc, Mutex}; use std::thread; fn count_words_in_chunk(chunk: Vec<String>) -> HashMap<String, usize> { let mut word_count = HashMap::new(); for line in chunk { for word in line.split_whitespace() { *word_count.entry(word.to_string()).or_insert(0) += 1; } } word_count } fn main() { let file = File::open("/tmp/file.txt").expect("Failed to open file"); let reader = BufReader::new(file); let lines: Vec<_> = reader.lines().map(|l| l.unwrap()).collect(); let chunk_size = lines.len() / 4; let chunks: Vec<_> = lines.chunks(chunk_size).map(|chunk| chunk.to_vec()).collect(); let results: Vec<_> = (0..4).into_iter().map(|i| { let chunk = chunks[i].clone(); thread::spawn(move || count_words_in_chunk(chunk)) }).collect(); for result in results { let word_count = result.join().unwrap(); let json_output = serde_json::to_string(&word_count).unwrap(); println!("{}", json_output); } } |
warning: unused imports: `Arc`, `Mutex`
--> main.rs:5:17
|
5 | use std::sync::{Arc, Mutex};
| ^^^ ^^^^^
|
= note: `#[warn(unused_imports)]` on by default
error[E0433]: failed to resolve: use of undeclared crate or module `serde_json`
--> main.rs:35:27
|
35 | let json_output = serde_json::to_string(&word_count).unwrap();
| ^^^^^^^^^^ use of undeclared crate or module `serde_json`
error: aborting due to 1 previous error; 1 warning emitted
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