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import pandas as pd
import numpy as np
import matplotlib.pyplot as plt
from sklearn.metrics import classification_report, confusion_matrix
# ------------------------------------------------------------------ ## Classify dialog acts using zero-shot or fine-tuned transformer# ------------------------------------------------------------------ ## Sample dialog act dataset (5 categories)
da_examples = [
# (utterance, label)
("The weather is nice today.", "assertion"),
("It's raining outside.", "assertion"),
("The meeting is at 3pm.", "assertion"),
("Can you help me with this?", "directive"),
("Please send me the report by Friday.", "directive"),
("Close the window.", "directive"),
("Could you possibly pass me the salt?", "directive"), # Indirect directive
("What time does the train leave?", "question"),
("Where did you put the keys?", "question"),
("Did you finish the assignment?", "question"),
("I'll be there at 8.", "commissive"),
("I promise to call you back.", "commissive"),
("We will deliver by next week.", "commissive"),
("Thank you so much for your help!", "expressive"),
("I'm sorry for the inconvenience.", "expressive"),
("Congratulations on your promotion!", "expressive"),
("That's fantastic!", "expressive"),
]
df_da = pd.DataFrame(da_examples, columns=['utterance', 'label'])
labels_all = ['assertion', 'directive', 'question', 'commissive', 'expressive']
print(f"Dialog act examples: {len(df_da)} utterances, {df_da['label'].nunique()} categories")
print(df_da['label'].value_counts())
try:
from transformers import pipeline
classifier = pipeline("zero-shot-classification",
model="facebook/bart-large-mnli",
device=-1) # CPU# Classify each utterance
predictions = []
for _, row in df_da.iterrows():
result = classifier(row['utterance'], candidate_labels=labels_all)
pred = result['labels'][0]
predictions.append(pred)
print(f" '{row['utterance'][:50]}': pred={pred}, true={row['label']}")
df_da['predicted'] = predictions
print("\nClassification Report:")
print(classification_report(df_da['label'], df_da['predicted']))
except Exception as e:
print(f"Transformer not available ({e}); using rule-based classifier")
defrule_based_da(text):
"""Simple rule-based dialog act classifier."""
text_lower = text.lower().strip()
if text_lower.endswith('?') or text_lower.startswith(('what','where','when','who','how','did','do','is','are','can','could','would')):
return'question'elifany(w in text_lower for w in ["thank","sorry","congratulations","wonderful","great","fantastic"]):
return'expressive'elifany(w in text_lower for w in ["please","could you","would you","close","send","help","pass"]):
return'directive'elifany(w in text_lower for w in ["i'll","i will","i promise","i commit","we will","we'll"]):
return'commissive'else:
return'assertion'
df_da['predicted'] = df_da['utterance'].apply(rule_based_da)
print("Rule-based classification:")
print(classification_report(df_da['label'], df_da['predicted']))
# ---- Visualize confusion matrix -------------------------------- #from sklearn.metrics import confusion_matrix
cm = confusion_matrix(df_da['label'], df_da['predicted'], labels=labels_all)
fig, ax = plt.subplots(figsize=(8, 6))
im = ax.imshow(cm, cmap='Blues')
plt.colorbar(im, ax=ax)
ax.set_xticks(range(len(labels_all))); ax.set_xticklabels(labels_all, rotation=30, ha='right')
ax.set_yticks(range(len(labels_all))); ax.set_yticklabels(labels_all)
ax.set_xlabel("Predicted"); ax.set_ylabel("True")
ax.set_title("Dialog Act Confusion Matrix")
for i inrange(cm.shape[0]):
for j inrange(cm.shape[1]):
ax.text(j, i, str(cm[i,j]), ha='center', va='center',
color='white'if cm[i,j] > cm.max()/2else'black')
plt.tight_layout()
plt.savefig("dialog_act_cm.png", dpi=150)
plt.show()
Step 2: Politeness and Hedging Analysis
import pandas as pd
import numpy as np
import matplotlib.pyplot as plt
import re
# ------------------------------------------------------------------ ## Compute politeness features from text:# - Hedges, boosters, face-threatening act mitigation# - Based on Brown & Levinson (1987) and Danescu-Niculescu-Mizil et al. (2013)# ------------------------------------------------------------------ ## Define politeness markers
HEDGES = r'\b(maybe|perhaps|possibly|I think|I believe|I suppose|sort of|kind of|fairly|quite|a bit|somewhat|it seems|apparently|probably|might|could|would)\b'
BOOSTERS = r'\b(clearly|obviously|definitely|certainly|absolutely|exactly|of course|really|truly|in fact|undoubtedly)\b'
PLEASE = r'\bplease\b'
APOLOGIZE = r'\b(sorry|apologize|excuse me|pardon|forgive)\b'
QUESTIONS = r'\?'
NEGATIONS = r'\b(not|no|never|nothing|nobody|nowhere|neither)\b'
DIRECT_CMD = r'^(close|open|send|bring|give|stop|start|make|do|go|come|take)\b'defpoliteness_features(text):
"""Extract politeness features from an utterance."""
text_l = text.lower()
return {
'n_hedges': len(re.findall(HEDGES, text_l, re.IGNORECASE)),
'n_boosters': len(re.findall(BOOSTERS, text_l, re.IGNORECASE)),
'has_please': bool(re.search(PLEASE, text_l, re.IGNORECASE)),
'has_apology': bool(re.search(APOLOGIZE, text_l, re.IGNORECASE)),
'is_question': bool(re.search(QUESTIONS, text)),
'is_direct_cmd': bool(re.search(DIRECT_CMD, text_l)),
'length_words': len(text.split()),
}
# Sample requests varying in politeness
requests = [
("Close the door.", "bare imperative"),
("Close the door, please.", "please-marked"),
("Could you close the door?", "modal question"),
("Would you mind closing the door?", "would you mind"),
("I was wondering if you could possibly close the door.", "hedged request"),
("I'm sorry to bother you, but would it be too much to ask you to close the door?", "highly mitigated"),
("The door needs to be closed.", "impersonalized"),
("It's a bit cold in here.", "off-record hint"),
]
df_req = pd.DataFrame(requests, columns=['utterance', 'politeness_strategy'])
feat_cols = list(politeness_features(requests[0][0]).keys())
features = df_req['utterance'].apply(politeness_features).apply(pd.Series)
df_req = pd.concat([df_req, features], axis=1)
# Compute politeness score: hedge+please+question−direct_cmd
df_req['politeness_score'] = (
df_req['n_hedges'] * 2 +
df_req['has_please'].astype(int) * 1.5 +
df_req['has_apology'].astype(int) * 2 +
df_req['is_question'].astype(int) * 1 -
df_req['is_direct_cmd'].astype(int) * 2
)
print("Politeness Analysis of Request Formulations:")
print(df_req[['utterance','politeness_strategy','n_hedges','has_please','is_question',
'is_direct_cmd','politeness_score']].to_string(index=False))
fig, axes = plt.subplots(1, 2, figsize=(13, 5))
# Politeness score bar chart
y_pos = range(len(df_req))
colors = ['#2ecc71'if s >= 2else'#e67e22'if s >= 0else'#e74c3c'for s in df_req['politeness_score']]
axes[0].barh(y_pos, df_req['politeness_score'], color=colors, edgecolor='black', linewidth=0.7)
axes[0].set_yticks(y_pos)
axes[0].set_yticklabels([f"{r['politeness_strategy']}"for _, r in df_req.iterrows()], fontsize=8)
axes[0].set_xlabel("Politeness Score"); axes[0].set_title("Request Politeness Ranking")
axes[0].axvline(0, color='gray', linewidth=1); axes[0].grid(axis='x', alpha=0.3)
# Feature heatmap
feat_matrix = df_req[['n_hedges','has_please','has_apology','is_question','is_direct_cmd']].values.astype(float)
im = axes[1].imshow(feat_matrix.T, cmap='RdYlGn', aspect='auto')
plt.colorbar(im, ax=axes[1])
axes[1].set_xticks(range(len(df_req)))
axes[1].set_xticklabels([f"R{i+1}"for i inrange(len(df_req))], fontsize=8)
axes[1].set_yticks(range(5))
axes[1].set_yticklabels(['Hedges','Please','Apology','Question','Direct cmd'], fontsize=9)
axes[1].set_title("Politeness Feature Matrix")
plt.tight_layout()
plt.savefig("politeness_analysis.png", dpi=150)
plt.show()
Step 3: Discourse Coherence and Adjacency Pairs
import pandas as pd
import numpy as np
import matplotlib.pyplot as plt
import networkx as nx
from collections import Counter
# ------------------------------------------------------------------ ## Analyze dialog structure via adjacency pairs and turn-taking patterns# ------------------------------------------------------------------ ## Sample dialog (each entry: speaker, utterance, dialog act)
dialog = [
("A", "Hi, how are you doing?", "greeting"),
("B", "I'm fine, thanks. And you?", "greeting-response"),
("A", "Good. Did you finish the report?", "question"),
("B", "Almost. I just need a bit more time.", "assertion+commissive"),
("A", "When can I expect it?", "question"),
("B", "I'll have it ready by tomorrow morning.", "commissive"),
("A", "Could you send it before 9am?", "directive"),
("B", "Of course, no problem.", "commissive"),
("A", "Great. Also, could you add the Q4 data?", "directive"),
("B", "I'll check if I have access to that.", "commissive"),
("A", "If not, let me know.", "directive"),
("B", "Will do. Anything else?", "question"),
("A", "That's all for now. Thank you!", "expressive"),
("B", "You're welcome. Talk later.", "expressive"),
]
df_dialog = pd.DataFrame(dialog, columns=['speaker', 'utterance', 'dialog_act'])
df_dialog['turn'] = range(1, len(df_dialog) + 1)
# ---- Adjacency pair analysis ----------------------------------- ## An adjacency pair = consecutive (first pair part, second pair part)
pair_types = {
('greeting', 'greeting-response'): 'Greeting pair',
('question', 'assertion'): 'Q-A pair',
('question', 'assertion+commissive'): 'Q-A pair',
('question', 'commissive'): 'Q-Commitment pair',
('directive', 'commissive'): 'Request-Accept pair',
('expressive', 'expressive'): 'Leave-taking pair',
}
pairs_found = []
for i inrange(len(df_dialog) - 1):
da1 = df_dialog.iloc[i]['dialog_act']
da2 = df_dialog.iloc[i+1]['dialog_act']
pair_key = (da1, da2)
pair_name = pair_types.get(pair_key, f"{da1} → {da2}")
pairs_found.append({
'turn': df_dialog.iloc[i]['turn'],
'speaker_1': df_dialog.iloc[i]['speaker'],
'speaker_2': df_dialog.iloc[i+1]['speaker'],
'first_part': da1,
'second_part': da2,
'pair_type': pair_name,
})
df_pairs = pd.DataFrame(pairs_found)
print("Adjacency Pairs Found:")
print(df_pairs[['turn','speaker_1','first_part','speaker_2','second_part','pair_type']].to_string(index=False))
# ---- Dialog act sequence plot ---------------------------------- #
fig, axes = plt.subplots(1, 2, figsize=(14, 6))
# Turn-by-turn dialog act
da_colors = {
'greeting': '#3498db', 'greeting-response': '#3498db',
'question': '#e67e22', 'assertion': '#2ecc71',
'commissive': '#9b59b6', 'directive': '#e74c3c',
'expressive': '#1abc9c', 'assertion+commissive': '#8e44ad',
}
speaker_pos = {'A': 0.7, 'B': 0.3}
for _, row in df_dialog.iterrows():
color = da_colors.get(row['dialog_act'], 'gray')
y_pos = speaker_pos.get(row['speaker'], 0.5)
axes[0].scatter(row['turn'], y_pos, c=color, s=200, zorder=5,
edgecolors='black', linewidths=0.8)
axes[0].annotate(row['dialog_act'].split('+')[0][:4],
(row['turn'], y_pos),
fontsize=6, ha='center', va='bottom',
xytext=(0, 8), textcoords='offset points')
axes[0].set_yticks([0.3, 0.7]); axes[0].set_yticklabels(['Speaker B', 'Speaker A'])
axes[0].set_xlabel("Turn number"); axes[0].set_title("Dialog Act Sequence")
axes[0].grid(axis='x', alpha=0.3); axes[0].set_xlim(0, len(df_dialog)+1)
# Transition network
G = nx.DiGraph()
for _, row in df_pairs.iterrows():
src = row['first_part']
tgt = row['second_part']
if G.has_edge(src, tgt):
G[src][tgt]['weight'] += 1else:
G.add_edge(src, tgt, weight=1)
pos = nx.spring_layout(G, seed=42)
weights = [G[u][v]['weight'] * 2for u, v in G.edges()]
nx.draw_networkx(G, pos, ax=axes[1], node_size=1500, node_color='lightblue',
arrows=True, arrowsize=20, width=weights,
font_size=7, font_weight='bold', edge_color='gray')
axes[1].set_title("Dialog Act Transition Network"); axes[1].axis('off')
plt.tight_layout()
plt.savefig("discourse_analysis.png", dpi=150)
plt.show()
Advanced Usage
Implicature Detection
import numpy as np
# ------------------------------------------------------------------ ## Detect potential implicatures by checking Gricean maxim violations# ------------------------------------------------------------------ #defdetect_implicature_signals(utterance):
"""
Rule-based heuristics for identifying likely implicature contexts.
Returns signals suggesting non-literal interpretation.
"""import re
text = utterance.lower()
signals = []
# Quantity maxim: under-informativenessif re.search(r'\b(some|a few|a couple)\b', text):
signals.append(('quantity', "Under-informative: 'some' implicates 'not all'"))
# Manner: indirect phrasingif re.search(r'\b(it (would be|might be|could be))', text):
signals.append(('manner', "Periphrastic phrasing signals indirectness"))
# Relevance: apparent non-sequitur (harder to detect; needs context)# Hedges that weaken commitmentif re.search(r'\b(or something|kind of|sort of|I guess)\b', text):
signals.append(('quality', "Hedging suggests reduced epistemic commitment"))
# Scalar: scalar implicatureif re.search(r'\b(some|sometimes|occasionally|possible|might)\b', text):
signals.append(('scalar', "Scalar item — may implicate negation of stronger term"))
return signals
test_utterances = [
"Some students passed the exam.",
"The food was okay.",
"John is or might be coming.",
"I think it might possibly work.",
"It would be nice if someone cleaned this up.",
]
for utt in test_utterances:
signals = detect_implicature_signals(utt)
print(f"\nUtterance: '{utt}'")
if signals:
for sig_type, sig_desc in signals:
print(f" [{sig_type.upper()}] {sig_desc}")
else:
print(" No strong implicature signals detected")
Troubleshooting
Transformer model download too slow
# Use a smaller, faster model
classifier = pipeline("zero-shot-classification",
model="cross-encoder/nli-MiniLM2-L6-H768")
Zero-shot accuracy is poor for domain-specific dialog acts
Fix: Fine-tune on labeled data:
from transformers import AutoTokenizer, AutoModelForSequenceClassification
from transformers import Trainer, TrainingArguments
# Fine-tune on your labeled dialog act dataset
Rule-based politeness features miss context
Fix: Add context window (previous utterance) and use embeddings for similarity:
# Check if current utterance responds to a prior FTA# E.g., "Sorry to bother you" responds to an implicit FTA of making a request
Austin, J.L. (1962). How to Do Things with Words. Oxford University Press.
Searle, J.R. (1969). Speech Acts. Cambridge University Press.
Brown, P. & Levinson, S.C. (1987). Politeness. Cambridge University Press.
Grice, H.P. (1975). Logic and conversation. In Cole & Morgan (Eds.), Syntax and Semantics.
Examples
Example 1: Reddit Comment Politeness Scoring
import pandas as pd
reddit_comments = [
"Could someone please explain how this works?",
"This is wrong. Learn to read.",
"I might be mistaken, but perhaps the error is on line 23?",
"RTFM lol.",
"Would you mind sharing the error message? That would help a lot!",
]
for comment in reddit_comments:
feats = politeness_features(comment)
score = (feats['n_hedges']*2 + feats['has_please']*1.5 +
feats['is_question']*1 - feats['is_direct_cmd']*2)
print(f"Score={score:+.1f} '{comment[:60]}'")
Example 2: Topic-Control Analysis in Discourse
import pandas as pd
import numpy as np
# Simplified topic shift detection using sentence embeddings similaritytry:
from sentence_transformers import SentenceTransformer
import numpy as np
model = SentenceTransformer('all-MiniLM-L6-v2')
utterances = [u[1] for u in dialog]
embeddings = model.encode(utterances)
# Cosine similarity between consecutive utterances
similarities = []
for i inrange(len(embeddings)-1):
e1, e2 = embeddings[i], embeddings[i+1]
sim = np.dot(e1, e2) / (np.linalg.norm(e1) * np.linalg.norm(e2))
similarities.append(sim)
# Low similarity = topic shiftimport matplotlib.pyplot as plt
fig, ax = plt.subplots(figsize=(10, 3))
ax.plot(range(1, len(similarities)+1), similarities, 'b-o', markersize=6)
ax.axhline(0.7, color='red', linestyle='--', label='Topic shift threshold')
ax.set_xlabel("Turn transition"); ax.set_ylabel("Cosine similarity")
ax.set_title("Discourse Coherence — Consecutive Utterance Similarity")
ax.legend(); ax.grid(alpha=0.3)
plt.tight_layout(); plt.savefig("coherence.png", dpi=150); plt.show()
except ImportError:
print("sentence-transformers not installed; skipping embedding-based coherence analysis")
Last updated: 2026-03-17 | Maintainer: @xjtulycIssues: GitHub Issues
