pivot heldout csv

eval-logs/pivot_heldout_1782710967.csv

@@ -19,3 +19,5 @@ ts_unix_s,elapsed_s,phase,docs,tokens,chars,warmup_docs_target,vocab_size,merges
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 1782711594,586.174,train,3800,2038710,5231776,500,1056,800,3464.31,3478.00,6.483,1051.314465,1046.628854,6.957797,6.953172,10.037979,3.911583,3.897876,0.397093,573120.0,0.999643,0.999200,1.000000,1.000000,4.996509,5.750766,4.998718,4.998251,4.997815,4.995446,4.995074,0.015309,74.533817,98.596124,10.658074
 1782711625,616.899,train,4000,2145341,5505381,500,1056,800,3470.48,3477.62,6.484,1050.805935,1038.603784,6.957313,6.948062,10.037281,3.911335,3.897629,0.397800,573120.0,0.999616,0.999180,1.000000,1.000000,4.995746,5.687504,4.996592,4.995650,4.999358,4.996654,4.996166,0.010370,76.384035,101.447795,10.658074
+1782711656,648.025,train,4200,2253080,5783669,500,1056,800,3461.31,3476.84,6.481,1050.445226,1043.023680,6.956969,6.950133,10.036785,3.909919,3.896371,0.396750,573120.0,0.999592,0.998900,1.000000,1.000000,4.998036,5.765945,4.997736,4.995256,4.997010,4.999199,4.999380,0.012911,78.262918,104.344184,10.658074
+1782711686,678.446,train,4400,2359095,6054433,500,1056,800,3484.96,3477.20,6.485,1050.060564,1043.461431,6.956603,6.948819,10.036257,3.910603,3.897123,0.399460,573120.0,0.999556,0.998820,1.000000,1.000000,4.999396,5.689213,4.996481,4.997434,4.999203,4.996702,4.998914,0.012383,80.135618,107.240665,10.658074