remove pyyaml as a dependency

requirements.txt

@@ -6,7 +6,6 @@ nlp
 nltk
 numpy
 pandas
-pyyaml>=5.1
 scikit-learn
 scipy==1.4.1
 sentence_transformers

textattack/loggers/attack_log_manager.py

@@ -12,8 +12,6 @@ class AttackLogManager:
     def __init__(self):
         self.loggers = []
         self.results = []
-        self.max_words_changed = 0
-        self.max_seq_len = 2 ** 16
 
     def enable_stdout(self):
         self.loggers.append(FileLogger(stdout=True))
@@ -71,7 +69,9 @@ class AttackLogManager:
         # Count things about attacks.
         all_num_words = np.zeros(len(self.results))
         perturbed_word_percentages = np.zeros(len(self.results))
-        num_words_changed_until_success = np.zeros(2**16) # @ TODO: be smarter about this
+        num_words_changed_until_success = np.zeros(
+            2 ** 16
+        )  # @ TODO: be smarter about this
         failed_attacks = 0
         skipped_attacks = 0
         successful_attacks = 0
@@ -156,7 +156,7 @@ class AttackLogManager:
             summary_table_rows, "Attack Results", "attack_results_summary"
         )
         # Show histogram of words changed.
-        numbins = max(self.max_words_changed, 10)
+        numbins = max(max_words_changed, 10)
         for logger in self.loggers:
             logger.log_hist(
                 num_words_changed_until_success[:numbins],

textattack/shared/utils/install.py

@@ -10,7 +10,6 @@ import filelock
 import requests
 import torch
 import tqdm
-import yaml
 
 
 def path_in_cache(file_path):