pivot fast csv

eval-logs/pivot_fast_1782728334.csv

@@ -1 +1,2 @@
 elapsed_s,phase,docs,tokens,chars,vocab_size,merges,tok_per_s_interval,tok_per_s_cumulative,prequential_ppl,mean_nll,bits_per_token,bpb,mfu,flops_per_token,token_accuracy,top5_accuracy,w_freq,w_bigram,w_trigram,w_skip_bi,w_skip_tri,w_neural_phoneme,w_neural_word
+1348.978,train,90000,48529153,124999465,1056,800,24706.10,35974.75,1051.361943,6.957842,10.038044,3.878244,1.415956,573120.0,0.001262,1.000000,4.997591,5.655635,5.305442,4.997350,4.998231,4.996810,4.997369