Support incremental update of org-mode entries and embeddings

- What
  - Hash the entries and compare to find new/updated entries
  - Reuse embeddings encoded for existing entries
  - Only encode embeddings for updated or new entries
  - Merge the existing and new entries and embeddings to get the updated
    entries, embeddings

- Why
  - Given most note text entries are expected to be unchanged
    across time. Reusing their earlier encoded embeddings should
    significantly speed up embeddings updates
  - Previously we were regenerating embeddings for all entries,
    even if they had existed in previous runs

src/processor/ledger/beancount_to_jsonl.py

@@ -18,7 +18,7 @@ logger = logging.getLogger(__name__)
 
 
 # Define Functions
-def beancount_to_jsonl(beancount_files, beancount_file_filter, output_file):
+def beancount_to_jsonl(beancount_files, beancount_file_filter, output_file, previous_entries=None):
     # Input Validation
     if is_none_or_empty(beancount_files) and is_none_or_empty(beancount_file_filter):
         print("At least one of beancount-files or beancount-file-filter is required to be specified")
@@ -39,7 +39,7 @@ def beancount_to_jsonl(beancount_files, beancount_file_filter, output_file):
     elif output_file.suffix == ".jsonl":
         dump_jsonl(jsonl_data, output_file)
 
-    return entries
+    return list(enumerate(entries))
 
 
 def get_beancount_files(beancount_files=None, beancount_file_filter=None):

src/processor/markdown/markdown_to_jsonl.py

@@ -39,7 +39,7 @@ def markdown_to_jsonl(markdown_files, markdown_file_filter, output_file):
     elif output_file.suffix == ".jsonl":
         dump_jsonl(jsonl_data, output_file)
 
-    return entries
+    return list(enumerate(entries))
 
 
 def get_markdown_files(markdown_files=None, markdown_file_filter=None):

src/processor/org_mode/org_to_jsonl.py

@@ -7,6 +7,7 @@ import argparse
 import pathlib
 import glob
 import logging
+import hashlib
 
 # Internal Packages
 from src.processor.org_mode import orgnode
@@ -19,7 +20,7 @@ logger = logging.getLogger(__name__)
 
 
 # Define Functions
-def org_to_jsonl(org_files, org_file_filter, output_file):
+def org_to_jsonl(org_files, org_file_filter, output_file, previous_entries=None):
     # Input Validation
     if is_none_or_empty(org_files) and is_none_or_empty(org_file_filter):
         print("At least one of org-files or org-file-filter is required to be specified")
@@ -29,10 +30,41 @@ def org_to_jsonl(org_files, org_file_filter, output_file):
     org_files = get_org_files(org_files, org_file_filter)
 
     # Extract Entries from specified Org files
-    entries, file_to_entries = extract_org_entries(org_files)
+    entry_nodes, file_to_entries = extract_org_entries(org_files)
+    current_entries = convert_org_nodes_to_entries(entry_nodes, file_to_entries)
+
+    # Identify, mark and merge any new entries with previous entries
+    if not previous_entries:
+        entries_with_ids = list(enumerate(current_entries))
+    else:
+        # Hash all current and previous entries to identify new entries
+        current_entry_hashes = list(map(lambda e: hashlib.md5(bytes(json.dumps(e), encoding='utf-8')).hexdigest(), current_entries))
+        previous_entry_hashes = list(map(lambda e: hashlib.md5(bytes(json.dumps(e), encoding='utf-8')).hexdigest(), previous_entries))
+
+        hash_to_current_entries = dict(zip(current_entry_hashes, current_entries))
+        hash_to_previous_entries = dict(zip(previous_entry_hashes, previous_entries))
+
+        # All entries that did not exist in the previous set are to be added
+        new_entry_hashes = set(current_entry_hashes) - set(previous_entry_hashes)
+        # All entries that exist in both current and previous sets are kept
+        existing_entry_hashes = set(current_entry_hashes) & set(previous_entry_hashes)
+
+        # Mark new entries with no ids for later embeddings generation
+        new_entries = [
+            (None, hash_to_current_entries[entry_hash])
+            for entry_hash in new_entry_hashes
+        ]
+        # Set id of existing entries to their previous ids to reuse their existing encoded embeddings
+        existing_entries = [
+            (previous_entry_hashes.index(entry_hash), hash_to_previous_entries[entry_hash])
+            for entry_hash in existing_entry_hashes
+        ]
+        existing_entries_sorted = sorted(existing_entries, key=lambda e: e[0])
+        entries_with_ids = existing_entries_sorted + new_entries
 
     # Process Each Entry from All Notes Files
-    jsonl_data = convert_org_entries_to_jsonl(entries, file_to_entries)
+    entries = map(lambda entry: entry[1], entries_with_ids)
+    jsonl_data = convert_org_entries_to_jsonl(entries)
 
     # Compress JSONL formatted Data
     if output_file.suffix == ".gz":
@@ -40,7 +72,7 @@ def org_to_jsonl(org_files, org_file_filter, output_file):
     elif output_file.suffix == ".jsonl":
         dump_jsonl(jsonl_data, output_file)
 
-    return entries
+    return entries_with_ids
 
 
 def get_org_files(org_files=None, org_file_filter=None):
@@ -70,16 +102,16 @@ def extract_org_entries(org_files):
     entry_to_file_map = []
     for org_file in org_files:
         org_file_entries = orgnode.makelist(str(org_file))
-        entry_to_file_map += [org_file]*len(org_file_entries)
+        entry_to_file_map += zip(org_file_entries, [org_file]*len(org_file_entries))
         entries.extend(org_file_entries)
 
-    return entries, entry_to_file_map
+    return entries, dict(entry_to_file_map)
 
 
-def convert_org_entries_to_jsonl(entries, entry_to_file_map) -> str:
-    "Convert each Org-Mode entries to JSON and collate as JSONL"
-    jsonl = ''
-    for entry_id, entry in enumerate(entries):
+def convert_org_nodes_to_entries(entries: list[orgnode.Orgnode], entry_to_file_map) -> list[dict]:
+    "Convert Org-Mode entries into list of dictionary"
+    entry_maps = []
+    for entry in entries:
         entry_dict = dict()
 
         # Ignore title notes i.e notes with just headings and empty body
@@ -113,14 +145,17 @@ def convert_org_entries_to_jsonl(entries, entry_to_file_map) -> str:
 
         if entry_dict:
             entry_dict["raw"] = f'{entry}'
-            entry_dict["file"] = f'{entry_to_file_map[entry_id]}'
+            entry_dict["file"] = f'{entry_to_file_map[entry]}'
 
             # Convert Dictionary to JSON and Append to JSONL string
-            jsonl += f'{json.dumps(entry_dict, ensure_ascii=False)}\n'
+            entry_maps.append(entry_dict)
 
-    logger.info(f"Converted {len(entries)} to jsonl format")
+    return entry_maps
 
-    return jsonl
+
+def convert_org_entries_to_jsonl(entries) -> str:
+    "Convert each Org-Mode entry to JSON and collate as JSONL"
+    return ''.join([f'{json.dumps(entry_dict, ensure_ascii=False)}\n' for entry_dict in entries])
 
 
 if __name__ == '__main__':

src/search_type/text_search.py

@@ -55,15 +55,28 @@ def extract_entries(jsonl_file):
     return load_jsonl(jsonl_file)
 
 
-def compute_embeddings(entries, bi_encoder, embeddings_file, regenerate=False):
+def compute_embeddings(entries_with_ids, bi_encoder, embeddings_file, regenerate=False):
     "Compute (and Save) Embeddings or Load Pre-Computed Embeddings"
-    # Load pre-computed embeddings from file if exists
+    new_entries = []
+    # Load pre-computed embeddings from file if exists and update them if required
     if embeddings_file.exists() and not regenerate:
         corpus_embeddings = torch.load(get_absolute_path(embeddings_file), map_location=state.device)
         logger.info(f"Loaded embeddings from {embeddings_file}")
 
-    else:  # Else compute the corpus_embeddings from scratch, which can take a while
-        corpus_embeddings = bi_encoder.encode([entry['compiled'] for entry in entries], convert_to_tensor=True, device=state.device, show_progress_bar=True)
+        # Encode any new entries in the corpus and update corpus embeddings
+        new_entries = [entry['compiled'] for id, entry in entries_with_ids if id is None]
+        if new_entries:
+            new_embeddings = bi_encoder.encode(new_entries, convert_to_tensor=True, device=state.device, show_progress_bar=True)
+            existing_entry_ids = [id for id, _ in entries_with_ids if id is not None]
+            existing_embeddings = torch.index_select(corpus_embeddings, 0, torch.tensor(existing_entry_ids)) if existing_entry_ids else torch.Tensor()
+            corpus_embeddings = torch.cat([existing_embeddings, new_embeddings], dim=0)
+    # Else compute the corpus embeddings from scratch
+    else:
+        new_entries = [entry['compiled'] for _, entry in entries_with_ids]
+        corpus_embeddings = bi_encoder.encode(new_entries, convert_to_tensor=True, device=state.device, show_progress_bar=True)
+
+    # Save regenerated or updated embeddings to file
+    if new_entries:
         corpus_embeddings = util.normalize_embeddings(corpus_embeddings)
         torch.save(corpus_embeddings, embeddings_file)
         logger.info(f"Computed embeddings and saved them to {embeddings_file}")
@@ -169,16 +182,16 @@ def setup(text_to_jsonl, config: TextContentConfig, search_config: TextSearchCon
 
     # Map notes in text files to (compressed) JSONL formatted file
     config.compressed_jsonl = resolve_absolute_path(config.compressed_jsonl)
-    if not config.compressed_jsonl.exists() or regenerate:
-        text_to_jsonl(config.input_files, config.input_filter, config.compressed_jsonl)
+    previous_entries = extract_entries(config.compressed_jsonl) if config.compressed_jsonl.exists() else None
+    entries_with_indices = text_to_jsonl(config.input_files, config.input_filter, config.compressed_jsonl, previous_entries)
 
-    # Extract Entries
+    # Extract Updated Entries
     entries = extract_entries(config.compressed_jsonl)
     top_k = min(len(entries), top_k)  # top_k hits can't be more than the total entries in corpus
 
     # Compute or Load Embeddings
     config.embeddings_file = resolve_absolute_path(config.embeddings_file)
-    corpus_embeddings = compute_embeddings(entries, bi_encoder, config.embeddings_file, regenerate=regenerate)
+    corpus_embeddings = compute_embeddings(entries_with_indices, bi_encoder, config.embeddings_file, regenerate=regenerate)
 
     for filter in filters:
         filter.load(entries, regenerate=regenerate)

tests/test_org_to_jsonl.py

@@ -3,7 +3,7 @@ import json
 from posixpath import split
 
 # Internal Packages
-from src.processor.org_mode.org_to_jsonl import convert_org_entries_to_jsonl, extract_org_entries
+from src.processor.org_mode.org_to_jsonl import convert_org_entries_to_jsonl, convert_org_nodes_to_entries, extract_org_entries
 from src.utils.helpers import is_none_or_empty
 
 
@@ -21,10 +21,11 @@ def test_entry_with_empty_body_line_to_jsonl(tmp_path):
 
     # Act
     # Extract Entries from specified Org files
-    entries, entry_to_file_map = extract_org_entries(org_files=[orgfile])
+    entry_nodes, file_to_entries = extract_org_entries(org_files=[orgfile])
 
     # Process Each Entry from All Notes Files
-    jsonl_data = convert_org_entries_to_jsonl(entries, entry_to_file_map)
+    entries = convert_org_nodes_to_entries(entry_nodes, file_to_entries)
+    jsonl_data = convert_org_entries_to_jsonl(entries)
 
     # Assert
     assert is_none_or_empty(jsonl_data)
@@ -43,10 +44,11 @@ def test_entry_with_body_to_jsonl(tmp_path):
 
     # Act
     # Extract Entries from specified Org files
-    entries, entry_to_file_map = extract_org_entries(org_files=[orgfile])
+    entry_nodes, file_to_entries = extract_org_entries(org_files=[orgfile])
 
     # Process Each Entry from All Notes Files
-    jsonl_string = convert_org_entries_to_jsonl(entries, entry_to_file_map)
+    entries = convert_org_nodes_to_entries(entry_nodes, file_to_entries)
+    jsonl_string = convert_org_entries_to_jsonl(entries)
     jsonl_data = [json.loads(json_string) for json_string in jsonl_string.splitlines()] 
 
     # Assert