I have setup the docker container to run the model evaluation.
Write a self-contained Python 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} The program should be run by calling /path/to/python_word_count with no arguments. Make it run in parallel on 4 cores at the same time, each taking 1/4 of the file. Print out 4 differnt json dicts, one per line. I'll do the merging.
Write a self-contained Python 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} The program should be run by calling /path/to/python_word_count with no arguments. Make it run in parallel on 4 cores at the same time, each 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 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 | #!/usr/bin/env python3 import os import json import multiprocessing from collections import Counter import sys import math # --- Configuration --- FILE_PATH = "/tmp/file.txt" NUM_PROCESSES = 4 # Use UTF-8 encoding, ignore errors for bytes that cannot be decoded # (e.g., potentially split multi-byte characters at chunk boundaries) ENCODING = 'utf-8' DECODE_ERRORS = 'ignore' # --- End Configuration --- def count_words_in_chunk(file_path, start_byte, bytes_to_read): """ Reads a specific byte range (chunk) of a file, counts the occurrences of each word within that chunk, and prints the result as a JSON dictionary to standard output. Args: file_path (str): The path to the file. start_byte (int): The starting byte offset to read from. bytes_to_read (int): The number of bytes to read. """ word_counts = Counter() if bytes_to_read <= 0: # If there's nothing to read for this chunk, print empty JSON print(json.dumps({})) return try: with open(file_path, 'rb') as f: f.seek(start_byte) chunk_bytes = f.read(bytes_to_read) # Decode the byte chunk into text chunk_text = chunk_bytes.decode(ENCODING, errors=DECODE_ERRORS) # Split the text into words based on whitespace words = chunk_text.split() # Count the words using Counter for efficiency if words: word_counts.update(words) except FileNotFoundError: # This specific process might catch it if file disappears mid-run, # though the main block should catch it first. # Print error to stderr to avoid corrupting JSON output stream. print(f"Error: File '{file_path}' not found during chunk processing.", file=sys.stderr) # Print empty JSON for this process's output line print(json.dumps({})) return except Exception as e: # Catch other potential errors during file I/O or processing print(f"Error processing chunk starting at {start_byte}: {e}", file=sys.stderr) # Print empty JSON for this process's output line print(json.dumps({})) return # Convert the Counter object to a standard dictionary for JSON serialization # and print it to standard output, followed by a newline. print(json.dumps(dict(word_counts))) def main(): """ Main function to orchestrate the parallel word counting. """ # --- File Check and Size Calculation --- try: if not os.path.exists(FILE_PATH): raise FileNotFoundError(f"File not found at {FILE_PATH}") file_size = os.path.getsize(FILE_PATH) except Exception as e: print(f"Error accessing file: {e}", file=sys.stderr) # As per requirement, print N empty JSONs if file access fails for _ in range(NUM_PROCESSES): print(json.dumps({})) sys.exit(1) # --- Handle Empty File --- if file_size == 0: # If the file is empty, all processes should report zero counts. for _ in range(NUM_PROCESSES): print(json.dumps({})) sys.exit(0) # --- Calculate Chunk Sizes and Offsets --- # Determine the approximate size of each chunk base_chunk_size = file_size // NUM_PROCESSES remainder = file_size % NUM_PROCESSES tasks = [] current_byte = 0 for i in range(NUM_PROCESSES): # Distribute the remainder bytes across the first 'remainder' chunks chunk_bytes = base_chunk_size + (1 if i < remainder else 0) # Ensure we don't try to read past the end of the file (shouldn't happen with this logic, but safe) actual_bytes_to_read = min(chunk_bytes, file_size - current_byte) if actual_bytes_to_read < 0: # Handle potential edge case if file_size is very small actual_bytes_to_read = 0 tasks.append((FILE_PATH, current_byte, actual_bytes_to_read)) current_byte += chunk_bytes # Increment by the calculated chunk size # --- Parallel Processing --- # Ensure the main script logic runs only once, not in child processes # (This check is implicitly handled by the __name__ == "__main__" guard below) # Create a pool of worker processes # Using 'spawn' context can be more stable across platforms than 'fork' sometimes # multiprocessing.set_start_method('spawn', force=True) # Optional: uncomment if needed try: with multiprocessing.Pool(processes=NUM_PROCESSES) as pool: # Use starmap to apply the worker function to the calculated tasks. # We don't need the results collected here, as each process prints directly. # However, calling starmap ensures all tasks are executed and waited upon. pool.starmap(count_words_in_chunk, tasks) # Explicitly close the pool and wait for processes to finish pool.close() pool.join() except Exception as e: print(f"Error during multiprocessing: {e}", file=sys.stderr) # Attempt to print empty JSONs if pool creation/execution fails # Note: some might have already printed if failure was partial # This is a best-effort cleanup for the output format requirement # A more robust solution might track which ones printed successfully. for _ in range(NUM_PROCESSES): print(json.dumps({})) sys.exit(1) if __name__ == "__main__": # This check is crucial for multiprocessing to work correctly on # platforms like Windows, preventing infinite process spawning. main() |
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 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 | #!/usr/bin/env python3 import os import json import multiprocessing from collections import Counter import sys import math # --- Configuration --- FILE_PATH = "/tmp/file.txt" NUM_PROCESSES = 4 # Use UTF-8 encoding, ignore errors for bytes that cannot be decoded # (e.g., potentially split multi-byte characters at chunk boundaries) ENCODING = 'utf-8' DECODE_ERRORS = 'ignore' # --- End Configuration --- def count_words_in_chunk(file_path, start_byte, bytes_to_read): """ Reads a specific byte range (chunk) of a file, counts the occurrences of each word within that chunk, and prints the result as a JSON dictionary to standard output. Args: file_path (str): The path to the file. start_byte (int): The starting byte offset to read from. bytes_to_read (int): The number of bytes to read. """ word_counts = Counter() if bytes_to_read <= 0: # If there's nothing to read for this chunk, print empty JSON print(json.dumps({})) return try: with open(file_path, 'rb') as f: f.seek(start_byte) chunk_bytes = f.read(bytes_to_read) # Decode the byte chunk into text chunk_text = chunk_bytes.decode(ENCODING, errors=DECODE_ERRORS) # Split the text into words based on whitespace words = chunk_text.split() # Count the words using Counter for efficiency if words: word_counts.update(words) except FileNotFoundError: # This specific process might catch it if file disappears mid-run, # though the main block should catch it first. # Print error to stderr to avoid corrupting JSON output stream. print(f"Error: File '{file_path}' not found during chunk processing.", file=sys.stderr) # Print empty JSON for this process's output line print(json.dumps({})) return except Exception as e: # Catch other potential errors during file I/O or processing print(f"Error processing chunk starting at {start_byte}: {e}", file=sys.stderr) # Print empty JSON for this process's output line print(json.dumps({})) return # Convert the Counter object to a standard dictionary for JSON serialization # and print it to standard output, followed by a newline. print(json.dumps(dict(word_counts))) def main(): """ Main function to orchestrate the parallel word counting. """ # --- File Check and Size Calculation --- try: if not os.path.exists(FILE_PATH): raise FileNotFoundError(f"File not found at {FILE_PATH}") file_size = os.path.getsize(FILE_PATH) except Exception as e: print(f"Error accessing file: {e}", file=sys.stderr) # As per requirement, print N empty JSONs if file access fails for _ in range(NUM_PROCESSES): print(json.dumps({})) sys.exit(1) # --- Handle Empty File --- if file_size == 0: # If the file is empty, all processes should report zero counts. for _ in range(NUM_PROCESSES): print(json.dumps({})) sys.exit(0) # --- Calculate Chunk Sizes and Offsets --- # Determine the approximate size of each chunk base_chunk_size = file_size // NUM_PROCESSES remainder = file_size % NUM_PROCESSES tasks = [] current_byte = 0 for i in range(NUM_PROCESSES): # Distribute the remainder bytes across the first 'remainder' chunks chunk_bytes = base_chunk_size + (1 if i < remainder else 0) # Ensure we don't try to read past the end of the file (shouldn't happen with this logic, but safe) actual_bytes_to_read = min(chunk_bytes, file_size - current_byte) if actual_bytes_to_read < 0: # Handle potential edge case if file_size is very small actual_bytes_to_read = 0 tasks.append((FILE_PATH, current_byte, actual_bytes_to_read)) current_byte += chunk_bytes # Increment by the calculated chunk size # --- Parallel Processing --- # Ensure the main script logic runs only once, not in child processes # (This check is implicitly handled by the __name__ == "__main__" guard below) # Create a pool of worker processes # Using 'spawn' context can be more stable across platforms than 'fork' sometimes # multiprocessing.set_start_method('spawn', force=True) # Optional: uncomment if needed try: with multiprocessing.Pool(processes=NUM_PROCESSES) as pool: # Use starmap to apply the worker function to the calculated tasks. # We don't need the results collected here, as each process prints directly. # However, calling starmap ensures all tasks are executed and waited upon. pool.starmap(count_words_in_chunk, tasks) # Explicitly close the pool and wait for processes to finish pool.close() pool.join() except Exception as e: print(f"Error during multiprocessing: {e}", file=sys.stderr) # Attempt to print empty JSONs if pool creation/execution fails # Note: some might have already printed if failure was partial # This is a best-effort cleanup for the output format requirement # A more robust solution might track which ones printed successfully. for _ in range(NUM_PROCESSES): print(json.dumps({})) sys.exit(1) if __name__ == "__main__": # This check is crucial for multiprocessing to work correctly on # platforms like Windows, preventing infinite process spawning. main() |
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. Just tell me if they tried to parallelize it. #!/usr/bin/env python3 import os import json import multiprocessing from collections import Counter import sys import math # --- Configuration --- FILE_PATH = "/tmp/file.txt" NUM_PROCESSES = 4 # Use UTF-8 encoding, ignore errors for bytes that cannot be decoded # (e.g., potentially split multi-byte characters at chunk boundaries) ENCODING = 'utf-8' DECODE_ERRORS = 'ignore' # --- End Configuration --- def count_words_in_chunk(file_path, start_byte, bytes_to_read): """ Reads a specific byte range (chunk) of a file, counts the occurrences of each word within that chunk, and prints the result as a JSON dictionary to standard output. Args: file_path (str): The path to the file. start_byte (int): The starting byte offset to read from. bytes_to_read (int): The number of bytes to read. """ word_counts = Counter() if bytes_to_read <= 0: # If there's nothing to read for this chunk, print empty JSON print(json.dumps({})) return try: with open(file_path, 'rb') as f: f.seek(start_byte) chunk_bytes = f.read(bytes_to_read) # Decode the byte chunk into text chunk_text = chunk_bytes.decode(ENCODING, errors=DECODE_ERRORS) # Split the text into words based on whitespace words = chunk_text.split() # Count the words using Counter for efficiency if words: word_counts.update(words) except FileNotFoundError: # This specific process might catch it if file disappears mid-run, # though the main block should catch it first. # Print error to stderr to avoid corrupting JSON output stream. print(f"Error: File '{file_path}' not found during chunk processing.", file=sys.stderr) # Print empty JSON for this process's output line print(json.dumps({})) return except Exception as e: # Catch other potential errors during file I/O or processing print(f"Error processing chunk starting at {start_byte}: {e}", file=sys.stderr) # Print empty JSON for this process's output line print(json.dumps({})) return # Convert the Counter object to a standard dictionary for JSON serialization # and print it to standard output, followed by a newline. print(json.dumps(dict(word_counts))) def main(): """ Main function to orchestrate the parallel word counting. """ # --- File Check and Size Calculation --- try: if not os.path.exists(FILE_PATH): raise FileNotFoundError(f"File not found at {FILE_PATH}") file_size = os.path.getsize(FILE_PATH) except Exception as e: print(f"Error accessing file: {e}", file=sys.stderr) # As per requirement, print N empty JSONs if file access fails for _ in range(NUM_PROCESSES): print(json.dumps({})) sys.exit(1) # --- Handle Empty File --- if file_size == 0: # If the file is empty, all processes should report zero counts. for _ in range(NUM_PROCESSES): print(json.dumps({})) sys.exit(0) # --- Calculate Chunk Sizes and Offsets --- # Determine the approximate size of each chunk base_chunk_size = file_size // NUM_PROCESSES remainder = file_size % NUM_PROCESSES tasks = [] current_byte = 0 for i in range(NUM_PROCESSES): # Distribute the remainder bytes across the first 'remainder' chunks chunk_bytes = base_chunk_size + (1 if i < remainder else 0) # Ensure we don't try to read past the end of the file (shouldn't happen with this logic, but safe) actual_bytes_to_read = min(chunk_bytes, file_size - current_byte) if actual_bytes_to_read < 0: # Handle potential edge case if file_size is very small actual_bytes_to_read = 0 tasks.append((FILE_PATH, current_byte, actual_bytes_to_read)) current_byte += chunk_bytes # Increment by the calculated chunk size # --- Parallel Processing --- # Ensure the main script logic runs only once, not in child processes # (This check is implicitly handled by the __name__ == "__main__" guard below) # Create a pool of worker processes # Using 'spawn' context can be more stable across platforms than 'fork' sometimes # multiprocessing.set_start_method('spawn', force=True) # Optional: uncomment if needed try: with multiprocessing.Pool(processes=NUM_PROCESSES) as pool: # Use starmap to apply the worker function to the calculated tasks. # We don't need the results collected here, as each process prints directly. # However, calling starmap ensures all tasks are executed and waited upon. pool.starmap(count_words_in_chunk, tasks) # Explicitly close the pool and wait for processes to finish pool.close() pool.join() except Exception as e: print(f"Error during multiprocessing: {e}", file=sys.stderr) # Attempt to print empty JSONs if pool creation/execution fails # Note: some might have already printed if failure was partial # This is a best-effort cleanup for the output format requirement # A more robust solution might track which ones printed successfully. for _ in range(NUM_PROCESSES): print(json.dumps({})) sys.exit(1) if __name__ == "__main__": # This check is crucial for multiprocessing to work correctly on # platforms like Windows, preventing infinite process spawning. main() 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 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 | #!/usr/bin/env python3 import os import json import multiprocessing from collections import Counter import sys import math # --- Configuration --- FILE_PATH = "/tmp/file.txt" NUM_PROCESSES = 4 # Use UTF-8 encoding, ignore errors for bytes that cannot be decoded # (e.g., potentially split multi-byte characters at chunk boundaries) ENCODING = 'utf-8' DECODE_ERRORS = 'ignore' # --- End Configuration --- def count_words_in_chunk(file_path, start_byte, bytes_to_read): """ Reads a specific byte range (chunk) of a file, counts the occurrences of each word within that chunk, and prints the result as a JSON dictionary to standard output. Args: file_path (str): The path to the file. start_byte (int): The starting byte offset to read from. bytes_to_read (int): The number of bytes to read. """ word_counts = Counter() if bytes_to_read <= 0: # If there's nothing to read for this chunk, print empty JSON print(json.dumps({})) return try: with open(file_path, 'rb') as f: f.seek(start_byte) chunk_bytes = f.read(bytes_to_read) # Decode the byte chunk into text chunk_text = chunk_bytes.decode(ENCODING, errors=DECODE_ERRORS) # Split the text into words based on whitespace words = chunk_text.split() # Count the words using Counter for efficiency if words: word_counts.update(words) except FileNotFoundError: # This specific process might catch it if file disappears mid-run, # though the main block should catch it first. # Print error to stderr to avoid corrupting JSON output stream. print(f"Error: File '{file_path}' not found during chunk processing.", file=sys.stderr) # Print empty JSON for this process's output line print(json.dumps({})) return except Exception as e: # Catch other potential errors during file I/O or processing print(f"Error processing chunk starting at {start_byte}: {e}", file=sys.stderr) # Print empty JSON for this process's output line print(json.dumps({})) return # Convert the Counter object to a standard dictionary for JSON serialization # and print it to standard output, followed by a newline. print(json.dumps(dict(word_counts))) def main(): """ Main function to orchestrate the parallel word counting. """ # --- File Check and Size Calculation --- try: if not os.path.exists(FILE_PATH): raise FileNotFoundError(f"File not found at {FILE_PATH}") file_size = os.path.getsize(FILE_PATH) except Exception as e: print(f"Error accessing file: {e}", file=sys.stderr) # As per requirement, print N empty JSONs if file access fails for _ in range(NUM_PROCESSES): print(json.dumps({})) sys.exit(1) # --- Handle Empty File --- if file_size == 0: # If the file is empty, all processes should report zero counts. for _ in range(NUM_PROCESSES): print(json.dumps({})) sys.exit(0) # --- Calculate Chunk Sizes and Offsets --- # Determine the approximate size of each chunk base_chunk_size = file_size // NUM_PROCESSES remainder = file_size % NUM_PROCESSES tasks = [] current_byte = 0 for i in range(NUM_PROCESSES): # Distribute the remainder bytes across the first 'remainder' chunks chunk_bytes = base_chunk_size + (1 if i < remainder else 0) # Ensure we don't try to read past the end of the file (shouldn't happen with this logic, but safe) actual_bytes_to_read = min(chunk_bytes, file_size - current_byte) if actual_bytes_to_read < 0: # Handle potential edge case if file_size is very small actual_bytes_to_read = 0 tasks.append((FILE_PATH, current_byte, actual_bytes_to_read)) current_byte += chunk_bytes # Increment by the calculated chunk size # --- Parallel Processing --- # Ensure the main script logic runs only once, not in child processes # (This check is implicitly handled by the __name__ == "__main__" guard below) # Create a pool of worker processes # Using 'spawn' context can be more stable across platforms than 'fork' sometimes # multiprocessing.set_start_method('spawn', force=True) # Optional: uncomment if needed try: with multiprocessing.Pool(processes=NUM_PROCESSES) as pool: # Use starmap to apply the worker function to the calculated tasks. # We don't need the results collected here, as each process prints directly. # However, calling starmap ensures all tasks are executed and waited upon. pool.starmap(count_words_in_chunk, tasks) # Explicitly close the pool and wait for processes to finish pool.close() pool.join() except Exception as e: print(f"Error during multiprocessing: {e}", file=sys.stderr) # Attempt to print empty JSONs if pool creation/execution fails # Note: some might have already printed if failure was partial # This is a best-effort cleanup for the output format requirement # A more robust solution might track which ones printed successfully. for _ in range(NUM_PROCESSES): print(json.dumps({})) sys.exit(1) if __name__ == "__main__": # This check is crucial for multiprocessing to work correctly on # platforms like Windows, preventing infinite process spawning. main() |
{"it": 4, "was": 4, "the": 4, "best": 1, "of": 4, "times,": 2, "worst": 1, "age": 2, "wisdom,": 1, "foolish": 1}
{"ness,": 1, "it": 4, "was": 4, "the": 3, "epoch": 2, "of": 3, "belief,": 1, "incredulity,": 1, "season": 1, "Light,": 1, "th": 1}
{"e": 1, "season": 1, "of": 3, "Darkness,": 1, "it": 2, "was": 2, "the": 2, "spring": 1, "hope,": 1, "winter": 1, "despair,": 1, "we": 1, "had": 1, "everything": 1, "before": 1}
{"us,": 2, "we": 3, "had": 1, "nothing": 1, "before": 1, "were": 2, "all": 2, "going": 2, "direct": 2, "to": 1, "Heaven,": 1, "the": 1, "other": 1, "way": 1}
Resulting in output: {'it': 10, 'was': 10, 'the': 10, 'best': 1, 'of': 10, 'times,': 2, 'worst': 1, 'age': 2, 'wisdom,': 1, 'foolish': 1, 'ness,': 1, 'epoch': 2, 'belief,': 1, 'incredulity,': 1, 'season': 2, 'Light,': 1, 'th': 1, 'e': 1, 'Darkness,': 1, 'spring': 1, 'hope,': 1, 'winter': 1, 'despair,': 1, 'we': 4, 'had': 2, 'everything': 1, 'before': 2, 'us,': 2, 'nothing': 1, 'were': 2, 'all': 2, 'going': 2, 'direct': 2, 'to': 1, 'Heaven,': 1, 'other': 1, 'way': 1}
Testing if the previous output equals the string {'the': 11, 'it': 10, 'was': 10, 'of': 10, 'we': 4, 'times,': 2, 'age': 2, 'epoch': 2, 'season': 2, 'had': 2, 'before': 2, 'us,': 2, 'were': 2, 'all': 2, 'going': 2, 'direct': 2, 'best': 1, 'worst': 1, 'wisdom,': 1, 'foolishness,': 1, 'belief,': 1, 'incredulity,': 1, 'Light,': 1, 'Darkness,': 1, 'spring': 1, 'hope,': 1, 'winter': 1, 'despair,': 1, 'everything': 1, 'nothing': 1, 'to': 1, 'Heaven,': 1, 'other': 1, 'way': 1}
: False