RLCSE: fix MCMC and GatherFeatures, overwrite dumps (#395)

The JIT will append dumps to existing files, so using RLCSE to save
dumps was creating large files (each sequence's dump is periodically
updated to show the impact of the current parameters).

Also I was going to make MCMC and such subcommands, but changed my mind,
and forgot to hook the options back up.

src/jit-rl-cse/MLCSE.cs

@@ -376,7 +376,7 @@ static void PolicyGradient(IEnumerable<Method> methods)
         // number of times we cycle through the methods
         int nRounds = Get(s_commands.NumberOfRounds);
         // how many trials per method each cycle (minibatch)
-        int nIter =Get(s_commands.MinibatchSize);
+        int nIter = Get(s_commands.MinibatchSize);
         // how often to show results
         bool showEvery = Get(s_commands.ShowRounds);
         uint showEveryInterval = Get(s_commands.ShowRoundsInterval);
@@ -622,10 +622,20 @@ static void PolicyGradient(IEnumerable<Method> methods)
                                     QVDumpDot(method, s);
                                 }
 
-                                // Dump dasm/dump if we don't have one already
+                                // Write out dasm/dump for method with this sequence, and baseline.
+                                // Overwrite method dumps every so often, so we see fresh likelihood computations.
+                                // Dasm and baselines should not change so initial ones are fine.
                                 //
+                                bool shouldOverwriteDump = (r > 0) && (summaryInterval > 0) && (r % (4 * summaryInterval) == summaryInterval);
+
                                 string cleanSequence = updateSequence.Replace(',', '_');
                                 string dumpFile = Path.Combine(dumpDir, $"dump-{method.spmiIndex}-{cleanSequence}.d");
+
+                                if (shouldOverwriteDump && File.Exists(dumpFile))
+                                {
+                                    File.Delete(dumpFile);
+                                }
+
                                 if (!File.Exists(dumpFile))
                                 {
                                     List<string> dumpOptions = new List<string>(updateOptions);
@@ -801,7 +811,6 @@ static void PolicyGradient(IEnumerable<Method> methods)
                             Console.Write($" B:{MetricsParser.GetBaseLikelihoods(batchRuns[lastValidRun]),-60}");
                         }
                     }
-                    Console.Write(batchDetails[lastValidRun]);
                     Console.ResetColor();
                 }
             }
@@ -1022,7 +1031,7 @@ static void MCMC(IEnumerable<Method> methods)
         // Show each method's summary
         bool showEachCase = Get(s_commands.ShowEachMethod);
         // show each particular trial result
-        bool showEachRun = Get(s_commands.ShowEachRun);
+        bool showEachRun = Get(s_commands.ShowEachMCMCRun);
         // Show the Markov Chain
         bool showMC = Get(s_commands.ShowMarkovChain);
         // Draw the Markov Chain (tree)

src/jit-rl-cse/MLCSECommands.cs

@@ -133,6 +133,9 @@ public MLCSECommands(string[] args) : base("Use ML to explore JIT CSE Heuristics
         Options.Add(UseSpecificMethods);
         Options.Add(UseAdditionalMethods);
 
+        Options.Add(GatherFeatures);
+
+        Options.Add(DoMCMC);
         Options.Add(RememberMCMC);
         Options.Add(ShowEachMethod);
         Options.Add(ShowEachMCMCRun);