Add blob_path to config deduction message

BUILD.bazel

@@ -132,6 +132,7 @@ cc_library(
     deps = [
         ":basics",
         "//compression:types",
+        "//io",
         "//io:fields",
         "@highway//:hwy",  # base.h
     ],

gemma/configs.cc

@@ -23,6 +23,7 @@
 
 #include "compression/types.h"  // Type
 #include "io/fields.h"           // IFields
+#include "io/io.h"               // Path
 #include "hwy/base.h"
 
 namespace gcpp {
@@ -708,7 +709,7 @@ bool ModelConfig::OverwriteWithCanonical() {
   return found;
 }
 
-Model DeduceModel(size_t layers, int layer_types) {
+Model DeduceModel(const Path& blob_path, size_t layers, int layer_types) {
   switch (layers) {
     case 2:
       return Model::GEMMA_TINY;
@@ -740,8 +741,8 @@ Model DeduceModel(size_t layers, int layer_types) {
     return Model::PALIGEMMA2_772M_224;
     */
     default:
-      HWY_WARN("Failed to deduce model type from layer count %zu types %x.",
-               layers, layer_types);
+      HWY_WARN("Failed to deduce model type from %s, layer count %zu types %x.",
+               blob_path.path.c_str(), layers, layer_types);
       return Model::UNKNOWN;
   }
 }

gemma/configs.h

@@ -27,6 +27,7 @@
 
 #include "compression/types.h"  // Type
 #include "io/fields.h"           // IFieldsVisitor
+#include "io/io.h"               // Path
 #include "util/basics.h"
 
 namespace gcpp {
@@ -482,7 +483,7 @@ enum DeducedLayerTypes {
 };
 
 // layer_types is one or more of `DeducedLayerTypes`.
-Model DeduceModel(size_t layers, int layer_types);
+Model DeduceModel(const Path& blob_path, size_t layers, int layer_types);
 
 }  // namespace gcpp
 

gemma/model_store.cc

@@ -219,7 +219,8 @@ static ModelConfig ReadOrDeduceConfig(BlobReader& reader,
   // Always deduce so we can verify it against the config we read.
   const size_t layers = DeduceNumLayers(reader.Keys());
   const int layer_types = DeduceLayerTypes(reader);
-  const Model deduced_model = DeduceModel(layers, layer_types);
+  const Model deduced_model =
+      DeduceModel(reader.blob_path(), layers, layer_types);
 
   ModelConfig config;
   // Check first to prevent `CallWithSpan` from printing a warning.

io/blob_store.cc

@@ -297,7 +297,9 @@ class BlobStore {
 };  // BlobStore
 
 BlobReader::BlobReader(const Path& blob_path)
-    : file_(OpenFileOrAbort(blob_path, "r")), file_bytes_(file_->FileSize()) {
+    : blob_path_(blob_path),
+      file_(OpenFileOrAbort(blob_path, "r")),
+      file_bytes_(file_->FileSize()) {
   if (file_bytes_ == 0) HWY_ABORT("Zero-sized file %s", blob_path.path.c_str());
 
   BlobStore bs(*file_);

io/blob_store.h

@@ -54,6 +54,8 @@ class BlobReader {
   // Aborts on error.
   explicit BlobReader(const Path& blob_path);
 
+  const Path& blob_path() const { return blob_path_; }
+
   // Non-const version required for File::Map().
   File& file() { return *file_; }
   const File& file() const { return *file_; }
@@ -101,6 +103,7 @@ class BlobReader {
   }
 
  private:
+  Path blob_path_;
   std::unique_ptr<File> file_;
   const uint64_t file_bytes_;