add download utilities for vocab and encoder files

ch02/02_bonus_bytepair-encoder/bpe_openai_gpt2.py

@@ -3,6 +3,9 @@ Byte pair encoding utilities
 
 Code from https://github.com/openai/gpt-2/blob/master/src/encoder.py
 
+And modified code (download_vocab) from
+https://github.com/openai/gpt-2/blob/master/download_model.py
+
 Modified MIT License
 
 Software Copyright (c) 2019 OpenAI
@@ -34,6 +37,8 @@ OR OTHER DEALINGS IN THE SOFTWARE.
 import os
 import json
 import regex as re
+import requests
+from tqdm import tqdm
 from functools import lru_cache
 
 @lru_cache()
@@ -146,3 +151,24 @@ def get_encoder(model_name, models_dir):
         encoder=encoder,
         bpe_merges=bpe_merges,
     )
+
+
+def download_vocab():
+    # Modified code from
+    subdir = 'gpt2_model'
+    if not os.path.exists(subdir):
+        os.makedirs(subdir)
+    subdir = subdir.replace('\\','/') # needed for Windows
+
+    for filename in ['encoder.json', 'vocab.bpe']:
+
+        r = requests.get("https://openaipublic.blob.core.windows.net/gpt-2/models/117M" + "/" + filename, stream=True)
+
+        with open(os.path.join(subdir, filename), 'wb') as f:
+            file_size = int(r.headers["content-length"])
+            chunk_size = 1000
+            with tqdm(ncols=100, desc="Fetching " + filename, total=file_size, unit_scale=True) as pbar:
+                # 1k for chunk_size, since Ethernet packet size is around 1500 bytes
+                for chunk in r.iter_content(chunk_size=chunk_size):
+                    f.write(chunk)
+                    pbar.update(chunk_size)

ch02/02_bonus_bytepair-encoder/compare-bpe-tiktoken.ipynb

@@ -125,22 +125,41 @@
    "metadata": {},
    "outputs": [],
    "source": [
-    "from bpe_openai_gpt2 import get_encoder"
+    "from bpe_openai_gpt2 import get_encoder, download_vocab"
    ]
   },
   {
    "cell_type": "code",
    "execution_count": 8,
-   "id": "1888a7a9-9c40-4fe0-99b4-ebd20aa1ffd0",
+   "id": "35dd8d7c-8c12-4b68-941a-0fd05882dd45",
    "metadata": {},
-   "outputs": [],
+   "outputs": [
+    {
+     "name": "stderr",
+     "output_type": "stream",
+     "text": [
+      "Fetching encoder.json: 1.04Mit [00:00, 3.03Mit/s]                                                   \n",
+      "Fetching vocab.bpe: 457kit [00:00, 2.36Mit/s]                                                       \n"
+     ]
+    }
+   ],
    "source": [
-    "orig_tokenizer = get_encoder(model_name=\"gpt2\", models_dir=\".\")"
+    "download_vocab()"
    ]
   },
   {
    "cell_type": "code",
    "execution_count": 9,
+   "id": "1888a7a9-9c40-4fe0-99b4-ebd20aa1ffd0",
+   "metadata": {},
+   "outputs": [],
+   "source": [
+    "orig_tokenizer = get_encoder(model_name=\"gpt2_model\", models_dir=\".\")"
+   ]
+  },
+  {
+   "cell_type": "code",
+   "execution_count": 10,
    "id": "2740510c-a78a-4fba-ae18-2b156ba2dfef",
    "metadata": {},
    "outputs": [
@@ -160,7 +179,7 @@
   },
   {
    "cell_type": "code",
-   "execution_count": 10,
+   "execution_count": 11,
    "id": "434d115e-990d-42ad-88dd-31323a96e10f",
    "metadata": {},
    "outputs": [
@@ -188,7 +207,7 @@
   },
   {
    "cell_type": "code",
-   "execution_count": 11,
+   "execution_count": 12,
    "id": "5bfff386-f725-4137-9c50-e5da0c38bea0",
    "metadata": {},
    "outputs": [],
@@ -198,7 +217,7 @@
   },
   {
    "cell_type": "code",
-   "execution_count": 12,
+   "execution_count": 13,
    "id": "e9077bf4-f91f-42ad-ab76-f3d89128510e",
    "metadata": {},
    "outputs": [
@@ -216,7 +235,7 @@
        "'4.33.2'"
       ]
      },
-     "execution_count": 12,
+     "execution_count": 13,
      "metadata": {},
      "output_type": "execute_result"
     }
@@ -270,7 +289,7 @@
   },
   {
    "cell_type": "code",
-   "execution_count": 18,
+   "execution_count": 16,
    "id": "a61bb445-b151-4a2f-8180-d4004c503754",
    "metadata": {},
    "outputs": [],
@@ -281,7 +300,7 @@
   },
   {
    "cell_type": "code",
-   "execution_count": 19,
+   "execution_count": 17,
    "id": "57f7c0a3-c1fd-4313-af34-68e78eb33653",
    "metadata": {},
    "outputs": [
@@ -289,7 +308,7 @@
      "name": "stdout",
      "output_type": "stream",
      "text": [
-      "4.17 ms ± 18.2 µs per loop (mean ± std. dev. of 7 runs, 100 loops each)\n"
+      "4.12 ms ± 41.9 µs per loop (mean ± std. dev. of 7 runs, 100 loops each)\n"
      ]
     }
    ],
@@ -299,7 +318,7 @@
   },
   {
    "cell_type": "code",
-   "execution_count": 20,
+   "execution_count": 18,
    "id": "036dd628-3591-46c9-a5ce-b20b105a8062",
    "metadata": {},
    "outputs": [
@@ -307,7 +326,7 @@
      "name": "stdout",
      "output_type": "stream",
      "text": [
-      "1.68 ms ± 9.31 µs per loop (mean ± std. dev. of 7 runs, 1,000 loops each)\n"
+      "1.75 ms ± 8.5 µs per loop (mean ± std. dev. of 7 runs, 1,000 loops each)\n"
      ]
     }
    ],
@@ -317,7 +336,7 @@
   },
   {
    "cell_type": "code",
-   "execution_count": 22,
+   "execution_count": 19,
    "id": "b9c85b58-bfbc-465e-9a7e-477e53d55c90",
    "metadata": {},
    "outputs": [
@@ -332,7 +351,7 @@
      "name": "stdout",
      "output_type": "stream",
      "text": [
-      "8.81 ms ± 51.5 µs per loop (mean ± std. dev. of 7 runs, 100 loops each)\n"
+      "9.12 ms ± 856 µs per loop (mean ± std. dev. of 7 runs, 100 loops each)\n"
      ]
     }
    ],
@@ -342,7 +361,7 @@
   },
   {
    "cell_type": "code",
-   "execution_count": 26,
+   "execution_count": 20,
    "id": "7117107f-22a6-46b4-a442-712d50b3ac7a",
    "metadata": {},
    "outputs": [
@@ -350,21 +369,13 @@
      "name": "stdout",
      "output_type": "stream",
      "text": [
-      "8.8 ms ± 74 µs per loop (mean ± std. dev. of 7 runs, 100 loops each)\n"
+      "8.63 ms ± 247 µs per loop (mean ± std. dev. of 7 runs, 100 loops each)\n"
      ]
     }
    ],
    "source": [
     "%timeit hf_tokenizer(raw_text, max_length=5145, truncation=True)[\"input_ids\"]"
    ]
-  },
-  {
-   "cell_type": "code",
-   "execution_count": null,
-   "id": "0bcbacd5-b64f-4186-ab12-949b9483f556",
-   "metadata": {},
-   "outputs": [],
-   "source": []
   }
  ],
  "metadata": {