Revert `tests/testdata` changes and address flake8 issues

tests/testdata/pile_pubmed-central-v1-res.json

-{"results": {"pile_pubmed-central": {"bits_per_byte": 2.2812488135667854e-05, "byte_perplexity": 1.0000158125368497, "word_perplexity": 1.000123107107861}}, "versions": {"pile_pubmed-central": 1}}
+{"results": {"pile_pubmed-central": {"bits_per_byte": 2.2812488135667854e-05, "byte_perplexity": 1.0000158125368497, "word_perplexity": 1.000123107107861}}, "versions": {"pile_pubmed-central": 1}}
\ No newline at end of file

tests/testdata/pile_stackexchange-v0-loglikelihood_rolling

-e524bfb3e21cbdaddc117403a50df598520c7bf5b2c60ad8f2372cfa564e79be
+e524bfb3e21cbdaddc117403a50df598520c7bf5b2c60ad8f2372cfa564e79be
\ No newline at end of file

tests/testdata/pile_stackexchange-v0-res.json

-{"results": {"pile_stackexchange": {"bits_per_byte": 0.0002288815898835956, "byte_perplexity": 1.0002289077852733, "word_perplexity": 1.0016993562258851}}, "versions": {"pile_stackexchange": 0}}
+{"results": {"pile_stackexchange": {"bits_per_byte": 0.0002288815898835956, "byte_perplexity": 1.0002289077852733, "word_perplexity": 1.0016993562258851}}, "versions": {"pile_stackexchange": 0}}
\ No newline at end of file

tests/testdata/pile_stackexchange-v1-loglikelihood_rolling

-e524bfb3e21cbdaddc117403a50df598520c7bf5b2c60ad8f2372cfa564e79be
+e524bfb3e21cbdaddc117403a50df598520c7bf5b2c60ad8f2372cfa564e79be
\ No newline at end of file

tests/testdata/pile_stackexchange-v1-res.json

-{"results": {"pile_stackexchange": {"bits_per_byte": 0.0003302063346758449, "byte_perplexity": 1.0002289077852733, "word_perplexity": 1.0016993562258851}}, "versions": {"pile_stackexchange": 1}}
+{"results": {"pile_stackexchange": {"bits_per_byte": 0.0003302063346758449, "byte_perplexity": 1.0002289077852733, "word_perplexity": 1.0016993562258851}}, "versions": {"pile_stackexchange": 1}}
\ No newline at end of file

tests/testdata/pile_ubuntu-irc-v0-loglikelihood_rolling

-4eb69e314f0864ec8890e2323d7e76f8a8309692c4f090e2b41bf4be681a811d
+4eb69e314f0864ec8890e2323d7e76f8a8309692c4f090e2b41bf4be681a811d
\ No newline at end of file

tests/testdata/pile_ubuntu-irc-v0-res.json

-{"results": {"pile_ubuntu-irc": {"bits_per_byte": 1.6298315496830533e-06, "byte_perplexity": 1.0000016298328778, "word_perplexity": 1.0000108866656874}}, "versions": {"pile_ubuntu-irc": 0}}
+{"results": {"pile_ubuntu-irc": {"bits_per_byte": 1.6298315496830533e-06, "byte_perplexity": 1.0000016298328778, "word_perplexity": 1.0000108866656874}}, "versions": {"pile_ubuntu-irc": 0}}
\ No newline at end of file

tests/testdata/pile_ubuntu-irc-v1-loglikelihood_rolling

-4eb69e314f0864ec8890e2323d7e76f8a8309692c4f090e2b41bf4be681a811d
+4eb69e314f0864ec8890e2323d7e76f8a8309692c4f090e2b41bf4be681a811d
\ No newline at end of file

tests/testdata/pile_ubuntu-irc-v1-res.json

-{"results": {"pile_ubuntu-irc": {"bits_per_byte": 2.3513498942121155e-06, "byte_perplexity": 1.0000016298328778, "word_perplexity": 1.0000108866656874}}, "versions": {"pile_ubuntu-irc": 1}}
+{"results": {"pile_ubuntu-irc": {"bits_per_byte": 2.3513498942121155e-06, "byte_perplexity": 1.0000016298328778, "word_perplexity": 1.0000108866656874}}, "versions": {"pile_ubuntu-irc": 1}}
\ No newline at end of file

tests/testdata/pile_uspto-v0-loglikelihood_rolling

-789b2bdb31564d512b70f801316f49320a26c83ba361226bac0afb255341d477
+789b2bdb31564d512b70f801316f49320a26c83ba361226bac0afb255341d477
\ No newline at end of file

tests/testdata/pile_uspto-v0-res.json

-{"results": {"pile_uspto": {"bits_per_byte": 0.00012062434384130924, "byte_perplexity": 1.00012063161925, "word_perplexity": 1.0007716198916954}}, "versions": {"pile_uspto": 0}}
+{"results": {"pile_uspto": {"bits_per_byte": 0.00012062434384130924, "byte_perplexity": 1.00012063161925, "word_perplexity": 1.0007716198916954}}, "versions": {"pile_uspto": 0}}
\ No newline at end of file

tests/testdata/pile_uspto-v1-loglikelihood_rolling

-789b2bdb31564d512b70f801316f49320a26c83ba361226bac0afb255341d477
+789b2bdb31564d512b70f801316f49320a26c83ba361226bac0afb255341d477
\ No newline at end of file

tests/testdata/pile_uspto-v1-res.json

-{"results": {"pile_uspto": {"bits_per_byte": 0.000174024142670342, "byte_perplexity": 1.00012063161925, "word_perplexity": 1.0007716198916954}}, "versions": {"pile_uspto": 1}}
+{"results": {"pile_uspto": {"bits_per_byte": 0.000174024142670342, "byte_perplexity": 1.00012063161925, "word_perplexity": 1.0007716198916954}}, "versions": {"pile_uspto": 1}}
\ No newline at end of file

tests/testdata/pile_wikipedia-v0-loglikelihood_rolling

-ef9ec0dd408316ca6537228a6812e839f14b30608973081d41efc47c138338da
+ef9ec0dd408316ca6537228a6812e839f14b30608973081d41efc47c138338da
\ No newline at end of file

tests/testdata/pile_wikipedia-v0-res.json

-{"results": {"pile_wikipedia": {"bits_per_byte": 0.00016834722287561703, "byte_perplexity": 1.0001683613940646, "word_perplexity": 1.001084677949439}}, "versions": {"pile_wikipedia": 0}}
+{"results": {"pile_wikipedia": {"bits_per_byte": 0.00016834722287561703, "byte_perplexity": 1.0001683613940646, "word_perplexity": 1.001084677949439}}, "versions": {"pile_wikipedia": 0}}
\ No newline at end of file

tests/testdata/pile_wikipedia-v1-loglikelihood_rolling

-ef9ec0dd408316ca6537228a6812e839f14b30608973081d41efc47c138338da
+ef9ec0dd408316ca6537228a6812e839f14b30608973081d41efc47c138338da
\ No newline at end of file

tests/testdata/pile_wikipedia-v1-res.json

-{"results": {"pile_wikipedia": {"bits_per_byte": 0.00024287370359008176, "byte_perplexity": 1.0001683613940646, "word_perplexity": 1.001084677949439}}, "versions": {"pile_wikipedia": 1}}
+{"results": {"pile_wikipedia": {"bits_per_byte": 0.00024287370359008176, "byte_perplexity": 1.0001683613940646, "word_perplexity": 1.001084677949439}}, "versions": {"pile_wikipedia": 1}}
\ No newline at end of file

tests/testdata/pile_youtubesubtitles-v0-loglikelihood_rolling

-68263c52adc0086011e2220b619983935cabb1cc1f5f9f8ee1a74ab2a7457967
+68263c52adc0086011e2220b619983935cabb1cc1f5f9f8ee1a74ab2a7457967
\ No newline at end of file

tests/testdata/pile_youtubesubtitles-v0-res.json

-{"results": {"pile_youtubesubtitles": {"bits_per_byte": 2.3447170928931888e-05, "byte_perplexity": 1.000023447445816, "word_perplexity": 1.0001529192262875}}, "versions": {"pile_youtubesubtitles": 0}}
+{"results": {"pile_youtubesubtitles": {"bits_per_byte": 2.3447170928931888e-05, "byte_perplexity": 1.000023447445816, "word_perplexity": 1.0001529192262875}}, "versions": {"pile_youtubesubtitles": 0}}
\ No newline at end of file

tests/testdata/pile_youtubesubtitles-v1-loglikelihood_rolling

-68263c52adc0086011e2220b619983935cabb1cc1f5f9f8ee1a74ab2a7457967
+68263c52adc0086011e2220b619983935cabb1cc1f5f9f8ee1a74ab2a7457967
\ No newline at end of file