add an assert checking that multiplier limit is 1

Author: jmitrevs

hls4ml/templates/vivado/nnet_utils/nnet_sepconv1d_latency.h

@@ -32,6 +32,8 @@ void depthwise_conv_1d_latency_cl(data_T data[CONFIG_T::in_width * CONFIG_T::n_c
     // Limit multipliers to control parallelization
     #pragma HLS ALLOCATION operation instances=mul limit=CONFIG_T::mult_config::multiplier_limit
 
+    assert((CONFIG_T::n_filt == CONFIG_T::n_chan) && "only a depth multiplier of 1 is currently supported");
+
 PartitionLoop:
     for (int i_part = 0; i_part < CONFIG_T::n_partitions; i_part++) {
         #pragma HLS PIPELINE II=CONFIG_T::reuse_factor rewind

hls4ml/templates/vivado/nnet_utils/nnet_sepconv1d_stream.h

@@ -61,6 +61,9 @@ template <class data_T, class res_T, typename CONFIG_T>
 void depthwise_conv_1d_cl(hls::stream<data_T> &data, hls::stream<res_T> &res,
                           typename CONFIG_T::weight_t weights[CONFIG_T::filt_width * CONFIG_T::n_chan],
                           typename CONFIG_T::bias_t biases[CONFIG_T::n_chan]) {
+
+    assert((CONFIG_T::n_filt == CONFIG_T::n_chan) && "only a depth multiplier of 1 is currently supported");
+
     #pragma HLS inline recursive
     switch (CONFIG_T::implementation) {
     case conv_implementation::linebuffer:

hls4ml/templates/vivado/nnet_utils/nnet_sepconv2d_latency.h

@@ -33,6 +33,8 @@ void depthwise_conv_2d_latency_cl(
     // Limit multipliers to control parallelization
     #pragma HLS ALLOCATION operation instances=mul limit=CONFIG_T::mult_config::multiplier_limit
 
+    assert((CONFIG_T::n_filt == CONFIG_T::n_chan) && "only a depth multiplier of 1 is currently supported");
+
 PartitionLoop:
     for (int i_part = 0; i_part < CONFIG_T::n_partitions; i_part++) {
         #pragma HLS PIPELINE II=CONFIG_T::reuse_factor rewind

hls4ml/templates/vivado/nnet_utils/nnet_sepconv2d_stream.h

@@ -81,6 +81,9 @@ void depthwise_conv_2d_cl(
     hls::stream<data_T> &data, hls::stream<res_T> &res,
     typename CONFIG_T::weight_t weights[CONFIG_T::filt_height * CONFIG_T::filt_width * CONFIG_T::n_chan],
     typename CONFIG_T::bias_t biases[CONFIG_T::n_chan]) {
+
+    assert((CONFIG_T::n_filt == CONFIG_T::n_chan) && "only a depth multiplier of 1 is currently supported");
+
     #pragma HLS inline recursive
     switch (CONFIG_T::implementation) {
     case conv_implementation::linebuffer: