added experiment results

...ine/default/baseline_arxiv_results_2022-03-31_203310.json

...line/default/baseline_imdb_results_2022-03-31_160213.json

...line/default/baseline_sst2_results_2022-03-31_173328.json

.../pretrained/baseline_arxiv_results_2022-04-10_101250.json

...e/pretrained/baseline_imdb_results_2022-04-04_092824.json

...e/pretrained/baseline_sst2_results_2022-04-07_085613.json

..._mixer/default/mixer_arxiv_results_2022-04-04_092432.json

...p_mixer/default/mixer_imdb_results_2022-03-31_215521.json

...p_mixer/default/mixer_sst2_results_2022-03-31_232518.json

...xer/pretrained/mixer_arxiv_results_2022-04-07_085505.json

...ixer/pretrained/mixer_imdb_results_2022-04-10_101648.json

...ixer/pretrained/mixer_sst2_results_2022-04-10_101905.json