pivot heldout csv

eval-logs/pivot_heldout_1782710967.csv

@@ -12,3 +12,4 @@ ts_unix_s,elapsed_s,phase,docs,tokens,chars,warmup_docs_target,vocab_size,merges
 1782711346,338.464,train,2200,1180524,3033062,500,1056,800,3451.97,3487.89,6.500,1053.481357,1051.519001,6.959856,6.958159,10.040949,3.908124,3.894188,0.395679,573120.0,0.999795,0.999720,1.000000,1.000000,4.996757,5.746865,4.999196,4.998203,4.998694,4.998260,4.995521,0.001749,59.663762,76.202284,10.658074
 1782711377,368.680,train,2400,1285177,3299442,500,1056,800,3463.53,3485.89,6.510,1053.350254,1051.252012,6.959731,6.958327,10.040770,3.911015,3.896981,0.397004,573120.0,0.999776,0.999640,1.000000,1.000000,4.996891,5.785243,5.002254,4.999541,4.997738,4.997340,4.995816,0.006440,61.465525,78.847296,10.658074
 1782711408,399.757,train,2600,1392403,3574149,500,1056,800,3450.29,3483.12,6.504,1052.988052,1046.880795,6.959387,6.955265,10.040273,3.911450,3.897494,0.395486,573120.0,0.999760,0.999700,1.000000,1.000000,4.995988,5.631755,4.999369,4.997224,4.995924,4.995546,4.997875,0.023609,63.304961,81.572283,10.658074
+1782711438,430.454,train,2800,1498361,3848231,500,1056,800,3451.76,3480.89,6.505,1052.605343,1046.751610,6.959024,6.954247,10.039749,3.909113,3.895253,0.395655,573120.0,0.999737,0.999460,1.000000,1.000000,4.999046,5.733872,5.001927,4.998295,4.996583,4.999555,4.996262,0.016441,65.131268,84.301634,10.658074