diff --git a/examples/corpus_processing/openwebtext/download/Pipfile.lock b/examples/corpus_processing/openwebtext/download/Pipfile.lock
index f491411..d1faf5b 100644
--- a/examples/corpus_processing/openwebtext/download/Pipfile.lock
+++ b/examples/corpus_processing/openwebtext/download/Pipfile.lock
@@ -18,25 +18,32 @@
     "default": {
         "beautifulsoup4": {
             "hashes": [
-                "sha256:05fd825eb01c290877657a56df4c6e4c311b3965bda790c613a3d6fb01a5462a",
-                "sha256:9fbb4d6e48ecd30bcacc5b63b94088192dcda178513b2ae3c394229f8911b887",
-                "sha256:e1505eeed31b0f4ce2dbb3bc8eb256c04cc2b3b72af7d551a4ab6efd5cbe5dae"
+                "sha256:4c98143716ef1cb40bf7f39a8e3eec8f8b009509e74904ba3a7b315431577e35",
+                "sha256:84729e322ad1d5b4d25f805bfa05b902dd96450f43842c4e99067d5e1369eb25",
+                "sha256:fff47e031e34ec82bf17e00da8f592fe7de69aeea38be00523c04623c04fb666"
             ],
-            "version": "==4.8.2"
+            "version": "==4.9.3"
         },
         "certifi": {
             "hashes": [
-                "sha256:017c25db2a153ce562900032d5bc68e9f191e44e9a0f762f373977de9df1fbb3",
-                "sha256:25b64c7da4cd7479594d035c08c2d809eb4aab3a26e5a990ea98cc450c320f1f"
+                "sha256:2bbf76fd432960138b3ef6dda3dde0544f27cbf8546c458e60baf371917ba9ee",
+                "sha256:50b1e4f8446b06f41be7dd6338db18e0990601dce795c2b1686458aa7e8fa7d8"
             ],
-            "version": "==2019.11.28"
+            "version": "==2021.5.30"
         },
         "chardet": {
             "hashes": [
-                "sha256:84ab92ed1c4d4f16916e05906b6b75a6c0fb5db821cc65e70cbd64a3e2a5eaae",
-                "sha256:fc323ffcaeaed0e0a02bf4d117757b98aed530d9ed4531e3e15460124c106691"
+                "sha256:0d6f53a15db4120f2b08c94f11e7d93d2c911ee118b6b30a04ec3ee8310179fa",
+                "sha256:f864054d66fd9118f2e67044ac8981a54775ec5b67aed0441892edb553d21da5"
             ],
-            "version": "==3.0.4"
+            "version": "==4.0.0"
+        },
+        "click": {
+            "hashes": [
+                "sha256:8c04c11192119b1ef78ea049e0a6f0463e4c48ef00a30160c704337586f3ad7a",
+                "sha256:fba402a4a47334742d782209a7c79bc448911afe1149d07bdabdf480b3e2f4b6"
+            ],
+            "version": "==8.0.1"
         },
         "cssselect": {
             "hashes": [
@@ -53,11 +60,10 @@
         },
         "feedparser": {
             "hashes": [
-                "sha256:bd030652c2d08532c034c27fcd7c85868e7fa3cb2b17f230a44a6bbc92519bf9",
-                "sha256:cd2485472e41471632ed3029d44033ee420ad0b57111db95c240c9160a85831c",
-                "sha256:ce875495c90ebd74b179855449040003a1beb40cd13d5f037a0654251e260b02"
+                "sha256:1b00a105425f492f3954fd346e5b524ca9cef3a4bbf95b8809470e9857aa1074",
+                "sha256:f596c4b34fb3e2dc7e6ac3a8191603841e8d5d267210064e94d4238737452ddd"
             ],
-            "version": "==5.2.1"
+            "version": "==6.0.2"
         },
         "htmlmin": {
             "hashes": [
@@ -68,10 +74,18 @@
         },
         "idna": {
             "hashes": [
-                "sha256:7588d1c14ae4c77d74036e8c22ff447b26d0fde8f007354fd48a7814db15b7cb",
-                "sha256:a068a21ceac8a4d63dbfd964670474107f541babbd2250d61922f029858365fa"
+                "sha256:b307872f855b18632ce0c21c5e45be78c0ea7ae4c15c828c20788b26921eb3f6",
+                "sha256:b97d804b1e9b523befed77c48dacec60e6dcb0b5391d57af6a65a312a90648c0"
             ],
-            "version": "==2.9"
+            "version": "==2.10"
+        },
+        "importlib-metadata": {
+            "hashes": [
+                "sha256:833b26fb89d5de469b24a390e9df088d4e52e4ba33b01dc5e0e4f41b81a16c00",
+                "sha256:b142cc1dd1342f31ff04bb7d022492b09920cb64fed867cd3ea6f80fe3ebd139"
+            ],
+            "markers": "python_version < '3.8'",
+            "version": "==4.5.0"
         },
         "jieba3k": {
             "hashes": [
@@ -79,37 +93,63 @@
             ],
             "version": "==0.35.1"
         },
+        "joblib": {
+            "hashes": [
+                "sha256:9c17567692206d2f3fb9ecf5e991084254fe631665c450b443761c4186a613f7",
+                "sha256:feeb1ec69c4d45129954f1b7034954241eedfd6ba39b5e9e4b6883be3332d5e5"
+            ],
+            "version": "==1.0.1"
+        },
         "lxml": {
             "hashes": [
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-                "sha256:4235bc124fdcf611d02047d7034164897ade13046bda967768836629bc62784f",
-                "sha256:5828c7f3e615f3975d48f40d4fe66e8a7b25f16b5e5705ffe1d22e43fb1f6261",
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-                "sha256:d068f55bda3c2c3fcaec24bd083d9e2eede32c583faf084d6e4b9daaea77dde8",
-                "sha256:d5b3c4b7edd2e770375a01139be11307f04341ec709cf724e0f26ebb1eef12c3",
-                "sha256:deadf4df349d1dcd7b2853a2c8796593cc346600726eff680ed8ed11812382a7",
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-                "sha256:e5d842c73e4ef6ed8c1bd77806bf84a7cb535f9c0cf9b2c74d02ebda310070e1",
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-                "sha256:fe976a0f1ef09b3638778024ab9fb8cde3118f203364212c198f71341c0715ca"
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+                "sha256:36108c73739985979bf302006527cf8a20515ce444ba916281d1c43938b8bb96",
+                "sha256:39b78571b3b30645ac77b95f7c69d1bffc4cf8c3b157c435a34da72e78c82468",
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+                "sha256:542d454665a3e277f76954418124d67516c5f88e51a900365ed54a9806122b83",
+                "sha256:5a0a14e264069c03e46f926be0d8919f4105c1623d620e7ec0e612a2e9bf1c04",
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+                "sha256:884ab9b29feaca361f7f88d811b1eea9bfca36cf3da27768d28ad45c3ee6f969",
+                "sha256:89b8b22a5ff72d89d48d0e62abb14340d9e99fd637d046c27b8b257a01ffbe28",
+                "sha256:92e821e43ad382332eade6812e298dc9701c75fe289f2a2d39c7960b43d1e92a",
+                "sha256:b007cbb845b28db4fb8b6a5cdcbf65bacb16a8bd328b53cbc0698688a68e1caa",
+                "sha256:bc4313cbeb0e7a416a488d72f9680fffffc645f8a838bd2193809881c67dd106",
+                "sha256:bccbfc27563652de7dc9bdc595cb25e90b59c5f8e23e806ed0fd623755b6565d",
+                "sha256:c47ff7e0a36d4efac9fd692cfa33fbd0636674c102e9e8d9b26e1b93a94e7617",
+                "sha256:c4f05c5a7c49d2fb70223d0d5bcfbe474cf928310ac9fa6a7c6dddc831d0b1d4",
+                "sha256:cdaf11d2bd275bf391b5308f86731e5194a21af45fbaaaf1d9e8147b9160ea92",
+                "sha256:ce256aaa50f6cc9a649c51be3cd4ff142d67295bfc4f490c9134d0f9f6d58ef0",
+                "sha256:d2e35d7bf1c1ac8c538f88d26b396e73dd81440d59c1ef8522e1ea77b345ede4",
+                "sha256:d916d31fd85b2f78c76400d625076d9124de3e4bda8b016d25a050cc7d603f24",
+                "sha256:df7c53783a46febb0e70f6b05df2ba104610f2fb0d27023409734a3ecbb78fb2",
+                "sha256:e1cbd3f19a61e27e011e02f9600837b921ac661f0c40560eefb366e4e4fb275e",
+                "sha256:efac139c3f0bf4f0939f9375af4b02c5ad83a622de52d6dfa8e438e8e01d0eb0",
+                "sha256:efd7a09678fd8b53117f6bae4fa3825e0a22b03ef0a932e070c0bdbb3a35e654",
+                "sha256:f2380a6376dfa090227b663f9678150ef27543483055cc327555fb592c5967e2",
+                "sha256:f8380c03e45cf09f8557bdaa41e1fa7c81f3ae22828e1db470ab2a6c96d8bc23",
+                "sha256:f90ba11136bfdd25cae3951af8da2e95121c9b9b93727b1b896e3fa105b2f586"
             ],
-            "version": "==4.5.0"
+            "version": "==4.6.3"
         },
         "newspaper3k": {
             "hashes": [
@@ -121,41 +161,50 @@
         },
         "nltk": {
             "hashes": [
-                "sha256:bed45551259aa2101381bbdd5df37d44ca2669c5c3dad72439fa459b29137d94"
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-            "version": "==3.4.5"
+            "version": "==3.6.2"
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+                "sha256:a787ab10d7bb5494e5f76536ac460741788f1fbce851068d73a87ca7c35fc3e1",
+                "sha256:a7d5e9fad90eff8f6f6106d3b98b553a88b6f976e51fce287192a5d2d5363713",
+                "sha256:aac00e4bc94d1b7813fe882c28990c1bc2f9d0e1aa765a5f2b516e8a6a16a9e4",
+                "sha256:b91c36492a4bbb1ee855b7d16fe51379e5f96b85692dc8210831fbb24c43e484",
+                "sha256:c03c07ed32c5324939b19e36ae5f75c660c81461e312a41aea30acdd46f93a7c",
+                "sha256:c5236606e8570542ed424849f7852a0ff0bce2c4c8d0ba05cc202a5a9c97dee9",
+                "sha256:c6b39294464b03457f9064e98c124e09008b35a62e3189d3513e5148611c9388",
+                "sha256:cb7a09e173903541fa888ba010c345893cd9fc1b5891aaf060f6ca77b6a3722d",
+                "sha256:d68cb92c408261f806b15923834203f024110a2e2872ecb0bd2a110f89d3c602",
+                "sha256:dc38f57d8f20f06dd7c3161c59ca2c86893632623f33a42d592f097b00f720a9",
+                "sha256:e98eca29a05913e82177b3ba3d198b1728e164869c613d76d0de4bde6768a50e",
+                "sha256:f217c3954ce5fd88303fc0c317af55d5e0204106d86dea17eb8205700d47dec2"
             ],
             "index": "pypi",
-            "version": "==6.2.0"
+            "version": "==8.2.0"
         },
         "praw": {
             "hashes": [
@@ -167,10 +216,10 @@
         },
         "prawcore": {
             "hashes": [
-                "sha256:25dd14bf121bc0ad2ffc78e2322d9a01a516017105a5596cc21bb1e9a928b40c",
-                "sha256:ab5558efb438aa73fc66c4178bfc809194dea3ce2addf4dec873de7e2fd2824e"
+                "sha256:1f1eafc8a65d671f9892354f73142014fbb5d3a9ee621568c662d0a354e0578b",
+                "sha256:672d8a2faa12b44307874b2acfdd27f9cbaa5fa37bada4b34e36277224e6d8ed"
             ],
-            "version": "==1.0.1"
+            "version": "==1.5.0"
         },
         "psaw": {
             "hashes": [
@@ -203,33 +252,86 @@
             "index": "pypi",
             "version": "==5.1"
         },
+        "regex": {
+            "hashes": [
+                "sha256:01afaf2ec48e196ba91b37451aa353cb7eda77efe518e481707e0515025f0cd5",
+                "sha256:11d773d75fa650cd36f68d7ca936e3c7afaae41b863b8c387a22aaa78d3c5c79",
+                "sha256:18c071c3eb09c30a264879f0d310d37fe5d3a3111662438889ae2eb6fc570c31",
+                "sha256:1e1c20e29358165242928c2de1482fb2cf4ea54a6a6dea2bd7a0e0d8ee321500",
+                "sha256:281d2fd05555079448537fe108d79eb031b403dac622621c78944c235f3fcf11",
+                "sha256:314d66636c494ed9c148a42731b3834496cc9a2c4251b1661e40936814542b14",
+                "sha256:32e65442138b7b76dd8173ffa2cf67356b7bc1768851dded39a7a13bf9223da3",
+                "sha256:339456e7d8c06dd36a22e451d58ef72cef293112b559010db3d054d5560ef439",
+                "sha256:3916d08be28a1149fb97f7728fca1f7c15d309a9f9682d89d79db75d5e52091c",
+                "sha256:3a9cd17e6e5c7eb328517969e0cb0c3d31fd329298dd0c04af99ebf42e904f82",
+                "sha256:47bf5bf60cf04d72bf6055ae5927a0bd9016096bf3d742fa50d9bf9f45aa0711",
+                "sha256:4c46e22a0933dd783467cf32b3516299fb98cfebd895817d685130cc50cd1093",
+                "sha256:4c557a7b470908b1712fe27fb1ef20772b78079808c87d20a90d051660b1d69a",
+                "sha256:52ba3d3f9b942c49d7e4bc105bb28551c44065f139a65062ab7912bef10c9afb",
+                "sha256:563085e55b0d4fb8f746f6a335893bda5c2cef43b2f0258fe1020ab1dd874df8",
+                "sha256:598585c9f0af8374c28edd609eb291b5726d7cbce16be6a8b95aa074d252ee17",
+                "sha256:619d71c59a78b84d7f18891fe914446d07edd48dc8328c8e149cbe0929b4e000",
+                "sha256:67bdb9702427ceddc6ef3dc382455e90f785af4c13d495f9626861763ee13f9d",
+                "sha256:6d1b01031dedf2503631d0903cb563743f397ccaf6607a5e3b19a3d76fc10480",
+                "sha256:741a9647fcf2e45f3a1cf0e24f5e17febf3efe8d4ba1281dcc3aa0459ef424dc",
+                "sha256:7c2a1af393fcc09e898beba5dd59196edaa3116191cc7257f9224beaed3e1aa0",
+                "sha256:7d9884d86dd4dd489e981d94a65cd30d6f07203d90e98f6f657f05170f6324c9",
+                "sha256:90f11ff637fe8798933fb29f5ae1148c978cccb0452005bf4c69e13db951e765",
+                "sha256:919859aa909429fb5aa9cf8807f6045592c85ef56fdd30a9a3747e513db2536e",
+                "sha256:96fcd1888ab4d03adfc9303a7b3c0bd78c5412b2bfbe76db5b56d9eae004907a",
+                "sha256:97f29f57d5b84e73fbaf99ab3e26134e6687348e95ef6b48cfd2c06807005a07",
+                "sha256:980d7be47c84979d9136328d882f67ec5e50008681d94ecc8afa8a65ed1f4a6f",
+                "sha256:a91aa8619b23b79bcbeb37abe286f2f408d2f2d6f29a17237afda55bb54e7aac",
+                "sha256:ade17eb5d643b7fead300a1641e9f45401c98eee23763e9ed66a43f92f20b4a7",
+                "sha256:b9c3db21af35e3b3c05764461b262d6f05bbca08a71a7849fd79d47ba7bc33ed",
+                "sha256:bd28bc2e3a772acbb07787c6308e00d9626ff89e3bfcdebe87fa5afbfdedf968",
+                "sha256:bf5824bfac591ddb2c1f0a5f4ab72da28994548c708d2191e3b87dd207eb3ad7",
+                "sha256:c0502c0fadef0d23b128605d69b58edb2c681c25d44574fc673b0e52dce71ee2",
+                "sha256:c38c71df845e2aabb7fb0b920d11a1b5ac8526005e533a8920aea97efb8ec6a4",
+                "sha256:ce15b6d103daff8e9fee13cf7f0add05245a05d866e73926c358e871221eae87",
+                "sha256:d3029c340cfbb3ac0a71798100ccc13b97dddf373a4ae56b6a72cf70dfd53bc8",
+                "sha256:e512d8ef5ad7b898cdb2d8ee1cb09a8339e4f8be706d27eaa180c2f177248a10",
+                "sha256:e8e5b509d5c2ff12f8418006d5a90e9436766133b564db0abaec92fd27fcee29",
+                "sha256:ee54ff27bf0afaf4c3b3a62bcd016c12c3fdb4ec4f413391a90bd38bc3624605",
+                "sha256:fa4537fb4a98fe8fde99626e4681cc644bdcf2a795038533f9f711513a862ae6",
+                "sha256:fd45ff9293d9274c5008a2054ecef86a9bfe819a67c7be1afb65e69b405b3042"
+            ],
+            "version": "==2021.4.4"
+        },
         "requests": {
             "hashes": [
-                "sha256:43999036bfa82904b6af1d99e4882b560e5e2c68e5c4b0aa03b655f3d7d73fee",
-                "sha256:b3f43d496c6daba4493e7c431722aeb7dbc6288f52a6e04e7b6023b0247817e6"
+                "sha256:27973dd4a904a4f13b263a19c866c13b92a39ed1c964655f025f3f8d3d75b804",
+                "sha256:c210084e36a42ae6b9219e00e48287def368a26d03a048ddad7bfee44f75871e"
             ],
-            "version": "==2.23.0"
+            "version": "==2.25.1"
         },
         "requests-file": {
             "hashes": [
-                "sha256:75c175eed739270aec3c5279ffd74e6527dada275c5c0d76b5817e9c86bb7dea",
-                "sha256:8f04aa6201bacda0567e7ac7f677f1499b0fc76b22140c54bc06edf1ba92e2fa"
+                "sha256:07d74208d3389d01c38ab89ef403af0cfec63957d53a0081d8eca738d0247d8e",
+                "sha256:dfe5dae75c12481f68ba353183c53a65e6044c923e64c24b2209f6c7570ca953"
             ],
-            "version": "==1.4.3"
+            "version": "==1.5.1"
+        },
+        "sgmllib3k": {
+            "hashes": [
+                "sha256:7868fb1c8bfa764c1ac563d3cf369c381d1325d36124933a726f29fcdaa812e9"
+            ],
+            "version": "==1.0.0"
         },
         "six": {
             "hashes": [
-                "sha256:236bdbdce46e6e6a3d61a337c0f8b763ca1e8717c03b369e87a7ec7ce1319c0a",
-                "sha256:8f3cd2e254d8f793e7f3d6d9df77b92252b52637291d0f0da013c76ea2724b6c"
+                "sha256:1e61c37477a1626458e36f7b1d82aa5c9b094fa4802892072e49de9c60c4c926",
+                "sha256:8abb2f1d86890a2dfb989f9a77cfcfd3e47c2a354b01111771326f8aa26e0254"
             ],
-            "version": "==1.14.0"
+            "version": "==1.16.0"
         },
         "soupsieve": {
             "hashes": [
-                "sha256:bdb0d917b03a1369ce964056fc195cfdff8819c40de04695a80bc813c3cfa1f5",
-                "sha256:e2c1c5dee4a1c36bcb790e0fabd5492d874b8ebd4617622c4f6a731701060dda"
+                "sha256:052774848f448cf19c7e959adf5566904d525f33a3f8b6ba6f6f8f26ec7de0cc",
+                "sha256:c2c1c2d44f158cdbddab7824a9af8c4f83c76b1e23e049479aa432feb6c4c23b"
             ],
-            "version": "==1.9.5"
+            "markers": "python_version >= '3.0'",
+            "version": "==2.2.1"
         },
         "tinysegmenter": {
             "hashes": [
@@ -253,26 +355,42 @@
             "index": "pypi",
             "version": "==4.32.1"
         },
+        "typing-extensions": {
+            "hashes": [
+                "sha256:0ac0f89795dd19de6b97debb0c6af1c70987fd80a2d62d1958f7e56fcc31b497",
+                "sha256:50b6f157849174217d0656f99dc82fe932884fb250826c18350e159ec6cdf342",
+                "sha256:779383f6086d90c99ae41cf0ff39aac8a7937a9283ce0a414e5dd782f4c94a84"
+            ],
+            "markers": "python_version < '3.8'",
+            "version": "==3.10.0.0"
+        },
         "update-checker": {
             "hashes": [
-                "sha256:59cfad7f9a0ee99f95f1dfc60f55bf184937bcab46a7270341c2c33695572453",
-                "sha256:70e39446fccf77b21192cf7a8214051fa93a636dc3b5c8b602b589d100a168b8"
+                "sha256:6a2d45bb4ac585884a6b03f9eade9161cedd9e8111545141e9aa9058932acb13",
+                "sha256:cbba64760a36fe2640d80d85306e8fe82b6816659190993b7bdabadee4d4bbfd"
             ],
-            "version": "==0.16"
+            "version": "==0.18.0"
         },
         "urllib3": {
             "hashes": [
-                "sha256:2f3db8b19923a873b3e5256dc9c2dedfa883e33d87c690d9c7913e1f40673cdc",
-                "sha256:87716c2d2a7121198ebcb7ce7cccf6ce5e9ba539041cfbaeecfb641dc0bf6acc"
+                "sha256:753a0374df26658f99d826cfe40394a686d05985786d946fbe4165b5148f5a7c",
+                "sha256:a7acd0977125325f516bda9735fa7142b909a8d01e8b2e4c8108d0984e6e0098"
             ],
-            "version": "==1.25.8"
+            "version": "==1.26.5"
         },
         "websocket-client": {
             "hashes": [
-                "sha256:0fc45c961324d79c781bab301359d5a1b00b13ad1b10415a4780229ef71a5549",
-                "sha256:d735b91d6d1692a6a181f2a8c9e0238e5f6373356f561bb9dc4c7af36f452010"
+                "sha256:3e2bf58191d4619b161389a95bdce84ce9e0b24eb8107e7e590db682c2d0ca81",
+                "sha256:abf306dc6351dcef07f4d40453037e51cc5d9da2ef60d0fc5d0fe3bcda255372"
+            ],
+            "version": "==1.0.1"
+        },
+        "zipp": {
+            "hashes": [
+                "sha256:3607921face881ba3e026887d8150cca609d517579abe052ac81fc5aeffdbd76",
+                "sha256:51cb66cc54621609dd593d1787f286ee42a5c0adbb4b29abea5a63edc3e03098"
             ],
-            "version": "==0.57.0"
+            "version": "==3.4.1"
         }
     },
     "develop": {}