EDA for the emotion_dataset_v1

[davchuks]

Description

[This PR introduces an exploratory data analysis (EDA) notebook for the emotion tagging project and sets up the foundation for model training.]

Key Changes

• Data ingest & schema validation
• Loads nurse_emotion.csv, inspects schema with df.info() and head()
• Data cleaning pipeline
• Lower-casing, punctuation removal, stop-word filtering, lemmatization
• Label profiling
• Class balance of emotionpolarity and emotionTags
• Plots saved: emotion_polarity_distribution.png, emotion_tags_distribution.png
• Text statistics & visualizations
• Token counts, n-grams, word clouds
• Boxplot: note length vs emotion tags → emotion_vs_note_length.png
• Temporal profiling
• Derived time-of-day buckets (Morning/Afternoon/Evening/Night)
• Distribution plot saved as emotion_by_time_of_day.png