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https://github.com/codeplea/genann.git
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genann: Optionally resolve activation functions at link time
Shave around 94 million instructions and 10 million branches off of execution trace of example4 if the sigmoid activation function is resolved at link-time. Before (`make`): ``` Performance counter stats for './example4': 98.988806 task-clock (msec) # 0.998 CPUs utilized 1 context-switches # 0.010 K/sec 0 cpu-migrations # 0.000 K/sec 79 page-faults # 0.798 K/sec 312,298,260 cycles # 3.155 GHz 1,094,183,752 instructions # 3.50 insn per cycle 212,007,732 branches # 2141.734 M/sec 62,774 branch-misses # 0.03% of all branches 0.099228100 seconds time elapsed ``` After: `make`: ``` Performance counter stats for './example4': 97.335180 task-clock (msec) # 0.998 CPUs utilized 0 context-switches # 0.000 K/sec 0 cpu-migrations # 0.000 K/sec 82 page-faults # 0.842 K/sec 306,722,357 cycles # 3.151 GHz 1,065,669,644 instructions # 3.47 insn per cycle 214,256,601 branches # 2201.225 M/sec 60,154 branch-misses # 0.03% of all branches 0.097577079 seconds time elapsed ``` `make sigmoid`: ``` Performance counter stats for './example4': 92.629610 task-clock (msec) # 0.997 CPUs utilized 0 context-switches # 0.000 K/sec 0 cpu-migrations # 0.000 K/sec 78 page-faults # 0.842 K/sec 291,863,801 cycles # 3.151 GHz 1,000,931,204 instructions # 3.43 insn per cycle 202,465,800 branches # 2185.757 M/sec 50,949 branch-misses # 0.03% of all branches 0.092889789 seconds time elapsed ``` Signed-off-by: Andrew Jeffery <andrew@aj.id.au>
This commit is contained in:
16
genann.h
16
genann.h
@@ -39,9 +39,9 @@ extern "C" {
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#define GENANN_RANDOM() (((double)rand())/RAND_MAX)
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#endif
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struct genann;
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typedef double (*genann_actfun)(double a);
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typedef double (*genann_actfun)(const struct genann *ann, double a);
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typedef struct genann {
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/* How many inputs, outputs, and hidden neurons. */
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@@ -70,8 +70,6 @@ typedef struct genann {
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} genann;
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/* Creates and returns a new ann. */
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genann *genann_init(int inputs, int hidden_layers, int hidden, int outputs);
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@@ -96,11 +94,11 @@ void genann_train(genann const *ann, double const *inputs, double const *desired
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/* Saves the ann. */
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void genann_write(genann const *ann, FILE *out);
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double genann_act_sigmoid(double a);
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double genann_act_sigmoid_cached(double a);
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double genann_act_threshold(double a);
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double genann_act_linear(double a);
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void genann_init_sigmoid_lookup(const genann *ann);
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double genann_act_sigmoid(const genann *ann, double a);
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double genann_act_sigmoid_cached(const genann *ann, double a);
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double genann_act_threshold(const genann *ann, double a);
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double genann_act_linear(const genann *ann, double a);
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#ifdef __cplusplus
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