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change profiling based partitoner's last_segment_latency to slowest_segment_latency #24

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change profiling based partitoner's last_segment_latency to slowest_segment_latency #24

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25 changes: 17 additions & 8 deletions coral/tools/partitioner/profiling_based_partitioner.cc
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Original file line number Diff line number Diff line change
Expand Up @@ -293,6 +293,7 @@ bool ProfilingBasedPartitioner::SearchPartition(
int64_t ProfilingBasedPartitioner::PartitionOnTargetLatency(
int64_t target_latency, int partition_search_step,
int delegate_search_step) {
int64_t segment_latency;
CHECK_GT(partition_search_step, 0);
// Initially, the first segment takes most operators and each other segment
// takes one operator.
Expand All @@ -308,14 +309,20 @@ int64_t ProfilingBasedPartitioner::PartitionOnTargetLatency(
}

CHECK_EQ(std::accumulate(num_ops.begin(), num_ops.end(), 0), total_num_ops);
const auto last_segment_latency = PartitionCompileAndAnalyze(
num_ops, num_segments_ - 1, delegate_search_step);

int64_t slowest_segment_latency = 0;
for (int i = 0; i < num_segments_; i++) {
segment_latency = PartitionCompileAndAnalyze(partition_, i);
if (segment_latency >= slowest_segment_latency)
slowest_segment_latency = segment_latency;
}

CHECK_GT(last_segment_latency, 0);
LOG(INFO) << "target_latency: " << target_latency
<< ", num_ops: " << absl::StrJoin(num_ops, ",")
<< ", last segment latency: " << last_segment_latency;
partition_ = num_ops;
return last_segment_latency;
return slowest_segment_latency;
}

bool BisectPartition(const std::string& edgetpu_compiler_binary,
Expand Down Expand Up @@ -345,21 +352,23 @@ bool BisectPartition(const std::string& edgetpu_compiler_binary,

while (std::abs(upper_bound - lower_bound) > diff_threshold_ns) {
const int64_t target_latency = (lower_bound + upper_bound) / 2;
const int64_t last_segment_latency = partitioner.PartitionOnTargetLatency(
target_latency, partition_search_step, delegate_search_step);
const int64_t slowest_segment_latency =
partitioner.PartitionOnTargetLatency(
target_latency, partition_search_step, delegate_search_step);

// If latency of the last segment is lower than `target_latency`, it
// means that `target_latency` gives a valid partition.
if (last_segment_latency < target_latency) {
if (slowest_segment_latency < target_latency) {
best_partition = partitioner.partition();
CHECK(!best_partition.empty());
upper_bound = target_latency;
} else {
// If latency of the last segment is higher than `target_latency` but
// lower than `upper_bound`, `upper_bound` could be updated as well.
if (last_segment_latency < upper_bound) {
if (slowest_segment_latency < upper_bound) {
best_partition = partitioner.partition();
CHECK(!best_partition.empty());
upper_bound = last_segment_latency;
upper_bound = slowest_segment_latency;
}
lower_bound = target_latency;
}
Expand Down