pivot heldout csv

eval-logs/pivot_heldout_1782710967.csv

@@ -7,3 +7,5 @@ ts_unix_s,elapsed_s,phase,docs,tokens,chars,warmup_docs_target,vocab_size,merges
 1782711192,184.104,train,1200,643662,1657635,500,1056,800,3484.11,3496.19,6.518,1054.880716,1053.428468,6.961183,6.959905,10.042864,3.899658,3.886122,0.399363,573120.0,0.999905,0.999860,1.000000,1.000000,4.998988,5.739808,4.996950,4.995657,4.999091,4.996414,4.999263,0.011420,50.519602,63.327375,10.658074
 1782711223,215.258,train,1400,751930,1934334,500,1056,800,3475.21,3493.15,6.504,1054.595209,1053.007413,6.960912,6.959303,10.042474,3.903792,3.890056,0.398342,573120.0,0.999872,0.999700,1.000000,1.000000,4.999384,5.752656,4.998882,4.997632,4.995551,4.998476,4.999631,0.003303,52.351898,65.823099,10.658074
 1782711254,245.772,train,1600,858450,2206138,500,1056,800,3490.83,3492.87,6.510,1054.203591,1051.750034,6.960541,6.957919,10.041938,3.907508,3.893968,0.400133,573120.0,0.999856,0.999800,1.000000,1.000000,4.999559,5.696548,4.995145,4.996804,4.999950,4.998809,4.995947,0.009895,54.182652,68.359974,10.658074
+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