pivot heldout csv

eval-logs/pivot_heldout_1782710967.csv

@@ -10,3 +10,5 @@ ts_unix_s,elapsed_s,phase,docs,tokens,chars,warmup_docs_target,vocab_size,merges
 1782711285,276.768,train,1800,966494,2483950,500,1056,800,3485.81,3492.08,6.504,1053.932446,1051.525311,6.960284,6.958240,10.041567,3.907129,3.893527,0.399558,573120.0,0.999831,0.999600,1.000000,1.000000,4.995898,5.784403,4.996330,4.999751,4.995633,4.996359,4.996810,0.014754,56.033551,70.968787,10.658074
 1782711315,307.422,train,2000,1073368,2759187,500,1056,800,3486.44,3491.51,6.506,1053.659763,1050.305474,6.960025,6.957685,10.041193,3.906185,3.892380,0.399630,573120.0,0.999804,0.999460,1.000000,1.000000,4.995170,5.748081,4.999660,4.999133,5.000124,4.995039,4.998917,0.006988,57.831572,73.541990,10.658074
 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